Customs Ruling HQ 964875 - SanDisk flash memory cards: CompactFlash; SmartMedia; MultiMedia; and Secure Digital Memory. (2023)

CLA-2 RR:CR:GC 964875 BJB

Jennifer F. Kessinger
Worldtrade Management Services
PricewaterhouseCoopers LLP
333 Market Street
San Francisco, CA 94105

RE: SanDisk flash memory cards: CompactFlash; SmartMedia; MultiMedia; and Secure Digital Memory.

Dear Ms. Kessinger:

This is in response to your letter of August 30, 2001, on behalf of your client, “SanDisk Corporation” (“SanDisk”), requesting a ruling on the classification of “non-volatile” or “flash memory” cards, pursuant to the Harmonized Tariff Schedule of the United States (HTSUS). In your letter, you also asked that an earlier ruling request, dated October 18, 2000, submitted by a customs broker, on behalf of SanDisk, and related to similar merchandise, be withdrawn. We regret the delay in responding.


The articles are identified as “flash memory cards.” They are SanDisk’s:

CompactFlash Card (“CF”);SmartMedia Card (“SM”);MultiMedia Card (“MM”); andSecure Digital Memory Card (“SDM”).

Flash memory cards provide memory in a flexible and non-volatile form. These cards hold their contents without power. They retain recorded data indefinitely. Flash memory may be written upon and erased in fixed blocks, generally ranging from 512 bytes up to 256 KB. The flash memory cards use the PCMCIA PC Card format, and are compatible with a range of host devices to store pictures, music, and data. Flash memory cards record data through semi-conductor technology rather than, e.g., magnetic field or laser beam technology. Flash memory retains information in a series of transistors, or cells, located on the card’s silicon chip.

To write or record information on the flash memory card, the host device initiates and sends a command to the card. Through a controller chip located either in the host, or on the card, this command applies a charge to the transistor. The charge is permanently stored until it is erased. The user’s ability to erase or record entire “blocks” of information in flash memory is a major advantage of the flash memory cards.

Once the host device has recorded data in flash memory, the device can read and decode the information, and use it to perform its intended function. A single flash memory card is capable of having multiple types of data files recorded upon it, enabling multiple applications to be run, by multiple types of host devices.

There are two types of the CompactFlash Card (CF card), Type I, original form factor, and Type II, a later type, form factor. In Type I, the CF card measures 42.8 mm x 36.4mm x 3.3 mm, about the size of a matchbook. The Type II CF card is 5 mm thick. The other dimensions remain the same, however, Type II also has more memory capacity. Thus, Type II provides up to 300 megabytes of formatted flash memory, and Type I provides up to 192 megabytes. In the Type II form factor, CF cards may be incorporated into a “CompactFlash” slot, for use with pagers, networking systems, and fax and modems.

The CF cards are used for digital cameras, handheld ADP machines, personal digital assistants (“PDAs”), personal communicators/pagers, audio recorders/MP3s, and global positioning devices (“GPS”).

2) The SmartMedia Card (SM), is approximately 45mm x 37mm x 0.76 mm. It is comprised of a plane electrode connected to a flash memory chip by bonding wires. These are embedded in a resin using a technique called over-molded thin package. The SM card can be purchased in a range of flash memory capacity from 8 to 32 megabytes.

3) The MultiMedia Card (MM) is smaller in size, measuring 32.0 mm x 24.0 mm x 1.4 mm. It weighs approximately 1.5 grams, and is available with memory capacities of 8, 16, 32, or 64 megabytes. It is smaller in size and used for compact electronic devices such as mobile telephones, pagers, voice recorders, digital audio players, digital cameras, multimedia devices, digital video recorders, and handheld global positioning devices.

4) The Secure Digital Memory Card (SDM) is 32 mm x 24 mm x 2.1mm. It is slightly thicker than a MultiMedia Card. This enables it to contain more memory for higher data capacity. It is designed and used for the same purposes as the MM card but has additional features, including: cryptographic security for protection of copyrighted data, a quadrupled maximum data transfer rate, a user-selectable write protect switch on the card casing, and improved electro-static discharge (“ESD”) tolerance through changes in the card’s protective casing. This card allows the host device to store and read data from flash memory in a way that is fully compatible with the licensing restrictions that may be imposed by an original source distributor.


What is the classification of the flash memory cards?


Classification under the HTSUS is made in accordance with the General Rules of Interpretation (GRIs). GRI 1 provides that the classification of goods shall be determined according to the terms of the headings of the tariff schedule and any relative Section or Chapter Notes. In the event that the goods cannot be classified solely on the basis of GRI 1, and if the headings and legal notes do not otherwise require, the remaining GRIs may then be applied.

In understanding the language of the HTSUS, the Harmonized Commodity Description and Coding System Explanatory Notes may be utilized. The Explanatory Notes (ENs), although not dispositive or legally binding, provide a commentary on the scope of each heading of the HTSUS, and are generally indicative of the proper interpretation of these headings. Customs believes the ENs should always be consulted. See T.D. 98-80, 54 Fed. Reg. 35127, 35128 (Aug. 23, 1989).

The HTSUS provisions under consideration are as follows:

Automatic data processing machines and units thereof: magnetic or optical readers, machines for transcribing data onto data media in coded form and machines for processing such data, not elsewhere specified or included:


8473Parts and accessories (other than covers, carrying cases and the like) suitable for use solely or principally with machines of headings 8469 to 8472:


Prepared unrecorded media for sound recording or similar recording of other phenomena, other than products of chapter 37:


Electrical machines and apparatus, having individual functions, not specified or included elsewhere in this chapter, parts thereof:


At GRI 1, prima facie, there are several headings that may provide for the subject flash memory cards. Heading 8471, HTSUS, provides for “[a]utomatic data processing machines and units thereof[;]” heading 8473, HTSUS, provides for “[p]arts and accessories . . . suitable for use solely or principally with machines of headings 8469 to 8472[;]” heading 8523, HTSUS, “[p]repared unrecorded media for sound recording or similar recording of other phenomena, other than products of chapter 37[;]” and heading 8543, HTSUS, which provides for “[e]lectrical machines and apparatus, having individual functions, not specified or included elsewhere in this chapter, parts thereof[.]”

Proceeding in numerical order, we consider heading 8471, which provides for “[c]ontrol or adapter units for ADP machines,” and heading 8473, which provides for “[p]rinted circuit assemblies for ADP machines[.]”

Chapter 84, Note 5(B) provides that, “[a]utomatic data processing machines may be in the form of systems consisting of a variable number of separate units[,]” subject to Note 5(E). Subject to the terms of Chapter 84, Legal Note 5(E), an article is regarded as being a part of a complete system “if it meets all of the following conditions:

It is of a kind solely or principally used in an automatic data processing system;It is connectable to the central processing unit either directly or through one or more other units; andIt is able to accept or deliver data in a form (codes or signals) which can be used by the system.”

While the flash memory cards may be used as additional memory, or interactively, with certain computer laptops and ADP machines, SanDisk represents that they are used in a variety of host devices, the majority of which are not ADP machines or apparatus. Specifically, documentation you have provided, and further information obtained directly from SanDisk’s internet website, confirm that all of the flash memory cards are used with a wide array of machines, including MP3 players, video cameras, still digital cameras, global positioning systems, as well as ADP machines.

Thus, although these flash memory cards may be used in conjunction with ADP machines, they all fail to meet the requirements of Chapter 84, Legal Note 5(B), insofar as they are not solely or principally used in an ADP system. As such, they may not be considered as units, or as parts or accessories of an ADP machine, and are not classifiable under headings 8471 or 8473, HTSUS.

Heading 8523 provides eo nomine for “[p]repared unrecorded media for sound recording or similar recording of other phenomena, other than products of chapter 37[.]” EN 85.23 lists five types of media that are “included” within the heading. We interpret the word “include” to mean that the list provides examples of prepared unrecorded media. None of the examples either mention, or exclude, “flash” or “non-volatile” memory.

Further, the terms, “prepared,” “unrecorded,” or “media,” are not more fully described. In the absence of a contrary legislative intent, tariff terms that are not defined in an HTSUS section or chapter note, or clearly described in an EN, are construed in accordance with their common and commercial meanings, which are presumed to be the same. Nippon Kogasku (USA), Inc., v. United States, 69 CCPA 89, 673 F.2d 380 (1982). Dictionaries, scientific authorities, and other reliable lexicographic sources are often consulted; and, where the terms under consideration are technical in nature, appropriate technical sources of information should be consulted. C.J. Tower & Sons v. United States, 69 CCPA 128, 673 F.2d 1268 (1982).

With respect to the terms “prepared,” “unrecorded,” and “media,” in heading 8523, the term “prepared” is described in Merriam-Webster’s Collegiate Dictionary, p. 920 (Tenth Ed., 1998), as “subjected to a special process or treatment[.]” The flash memory cards are prepared with flash memory chips, and placed in molded cards with electrical connectors for ready insertion into host devices.

The term “record” is defined as (1) A group of related fields that store data about a subject (master record) or activity (transaction record). A collection of records make up a file. (2) In certain disk organization methods, a record is a block of data read and written at one time without any relationship to records in a file.” The Computer Glossary, A. Freedman, p. 346 (Sixth Ed., 1993), and “to cause (as sound, visual images, or data) to be registered on something (as a disc or magnetic tape) in reproducible form[;]” and “something on which sound or visual images have been recorded[.]” Merriam-Webster’s Collegiate Dictionary, Id., at 977. All of the flash memory cards have “unrecorded” memory upon which data may be stored, recorded in block, and retrieved in reproducible form.

The term “media” is described, as “a material that stores or transmits data,” in The Computer Glossary, Id., at 256, and as “a medium of cultivation, conveyance, or expression[,] in Merriam-Webster’s Collegiate Dictionary, Id., at 721.

EN 85.23 does not set limitations with regard to the manner in which the media, within the scope of heading 8523, must function. The feature or function common to all media, regardless of type, is that they function as an instrument on which phenomena may be stored or retrieved upon demand from a host machine. Heading 8523 provides eo nomine for “prepared unrecorded media,” and “an eo nomine designation, without limitation or a shown contrary legislative intent, judicial decision, or administrative practice, and without proof of commercial designation, will include all forms of the article.” Nootka Packing Co. v. United States, 22 CCPA 464, T.D. 47464 (1935); Crosse & Blackwell Co. v. United States, 36 CCPA 33, C.A.D. 393 (1948) and cases cited; T.M. Duche & Sons, Inc. et al. v. United States, 44 CCPA 60, C.A.D. 638 (1957). The flash memory cards are in fact one of the latest forms of unrecorded storage media.

Flash memory cards also often contain an integrated circuit called a “controller chip.” This controller works electronically with the host device to ensure detection of bits in memory that have failed or are likely to fail due to the number of erase and write cycles such bits have undergone. This process allows the host with the controller to identify and write data to the spare “good” bits still remaining in the flash memory. This defect control appears to occur only when the flash memory card is inserted into a host device, and only when the host device is actively recording data to or erasing data from the flash memory. The controller chip function is similar to a “file allocation table” used on a magnetic floppy disk. The controller chip deals only in digital data and performs the mapping of the flash memory card for use by the host machine. Although SanDisk did not provide documentation as to which of its flash memory cards contain a controller chip, we find that, in the subject merchandise, the presence or absence of a controller chip does not change the basic storage repository function of the cards.

Heading 8543, HTSUS, provides for “[e]lectrical machines and apparatus, having individual functions, not specified or included elsewhere in this chapter, parts thereof[.]” EN 85.43 also provides that the “heading covers all electrical appliances and apparatus, not falling in any other heading of this Chapter, nor covered more specifically by a heading of any other Chapter of the Nomenclature, nor excluded by the operation of a Legal Note to Section XVI or to this Chapter.” (Emphasis in the original). EN 85.43 lists types of electrical machines and apparatus that are included within the heading. In particular, EN 85.43(14) provides,

“Proximity cards or tags and electronic proximity cards/tags, which may or may not have a magnetic stripe. Proximity cards/tags usually consist of an integrated circuit with a read only memory, which is attached to a printed antenna. The card/tag operates by creating a field interference (the nature of which is determined by a code contained in the read only memory) at the antenna in order to affect a signal transmitted from, and reflected back to, the reader. This type of card/tag does not transmit data.

Electrostatic proximity (ESP) cards/tags usually consist of a coil which is activated by a signal from a reader and produces a voltage to power a microcircuit, a code generator which on receiving a signal from the coil generates data, and a signal transmission antenna.”

While the proximity cards described here have “read only” memory capability, the subject flash memory cards are not “read only” memory devices. In contrast to the proximity cards described in EN 85.43 (14), encoded music and pictures, and other data, may be transmitted to, read, written, and erased, back and forth from the subject flash memory cards to an array of host devices. Further, as discussed above, the instant flash memory cards are specifically provided for as “media” of heading 8523, and are therefore, not classifiable in heading 8543, HTSUS..

The subheading which describes the flash memory cards is 8523.90.00, HTSUS, which provides for “[p]repared unrecorded media for sound recording or similar recording of other phenomena, other than products of chapter 37: Other.” Having established that the subject merchandise satisfies the terms provided in heading 8523, HTSUS, at GRI 1, and Chapter 85, Note 6, consideration of any other headings is precluded.

HOLDING: At GRI 1, the flash memory cards are classifiable in subheading 8523.90.00, HTSUS, which provides for “[p]repared unrecorded media for sound recording or similar recording of other phenomena, other than products of chapter 37: Other.”


John Durant, Director
Commercial Rulings Division


Are CF cards still used? ›

CF cards today are primarily used as removable memory for higher-end digital photo and video cameras. The original CompactFlash card was built using NOR flash memory.

Is CF cards Old or new? ›

CompactFlash (CF) is a flash memory mass storage device used mainly in portable electronic devices. The format was specified and the devices were first manufactured by SanDisk in 1994. CompactFlash became one of the most successful of the early memory card formats, surpassing Miniature Card and SmartMedia.

Which is better SD or CF? ›

Apart from size, the data transfer speeds for the CF card are more than double the speed of the SD card, despite their identical capacities and the fact that both have speed ratings that make them suitable for video recordings. (Source: SanDisk.)

How fast is CompactFlash? ›

Because the maximum speed of CompactFlash cards has been capped at 167 MB/s, almost all card manufacturers now offer cards capable of peak read and write performance at that speed.

Do CompactFlash cards wear out? ›

Memory cards do wear out. The part that wears out is the contact grid of the memory card. Transcend rates their cards at 10,000 insertion/removal cycles. Sandisk rates their cards at 10,000 insertion/removal cycles.

Do CF cards fail? ›

A Compact Flash card is a memory card which is usually used in a camera or smartphone. Like other data storage media, it can get damaged as well. Corruption of compact flash card can be a distressing issue for several CF card users. As once a flash card is corrupted, it will lose all the information stored in the card.

Do SD cards last forever? ›

SD standards-based memory cards, like most semiconductor cards, store information in flash memory. The current technology along with normal usage typically gives the card a lifespan of 10 years or more, allowing consumers to upgrade their devices for many years and reduce consumer electronic waste.

Can SD cards go bad? ›

Short answer: yes. After undergoing the excessive writing and erasing that accompanies heavy use, the flash memory systems micro SD cards operate with can wear out. It's always a good idea to back up your files and keep multiple cards on hand, especially if you often use your SD card.

What brand of SD card is most reliable? ›

The Best SD Cards of 2022
  • Best Overall. SanDisk Extreme Pro 32GB (95 MB/s)
  • Fujifilm Elite Performance 32GB (85 MB/s)
  • SanDisk 64GB Extreme PRO 64G.
  • Lexar Professional 128GB.
  • Prograde Digital 128GB.
3 Oct 2022

What's the difference between XC and HC on SD card? ›

SDHC (high capacity) cards can store up to 32 GB of data, while SDXC (extended capacity) cards can store up to 2 terabytes (2000 GB). Older devices may not be able to use the SDXC format, so make sure your device does support these larger cards before buying one.

What's the best SD card on the market? ›

The best SD cards 2022
  • SanDisk Extreme Pro SDXC UHS-I. ...
  • Lexar Professional 633x UHS-I. ...
  • PNY Elite Performance SDXC. ...
  • SanDisk Extreme PRO SDXC UHS-II V90. ...
  • Lexar Professional Class 10 UHS-II 2000X. ...
  • Sony SF-G Series TOUGH UHS-II. ...
  • Lexar Professional 1667x SDXC UHS-II. ...
  • SanDisk Extreme SD UHS-I V3.
20 Sept 2022

Why do professionals still use CompactFlash? ›

Pro cameras tend to use Compact Flash because pro photographers prefer the size of Compact Flash cards. They're bigger, easier to handle with gloves on, harder to lose. They're also perceived as being tougher due to the size.

Is class 10 the fastest SD card? ›

Class 10 is the fastest, suitable for “full HD video recording” and “HD still consecutive recording.” Class 2 is the slowest, suitable for standard definition video recording. Classes 4 and 6 are both deemed suitable for high-definition video recording.

How long does an SD card last in a security camera? ›

Most quality, high endurance SD cards that are being used for constant monitoring have a lifespan of 10,000 hours of continuous reading and writing. That's about 1 year! Remember, It's always a good idea to check your SD cards every month to make sure they are being written properly.

How long can SD card hold data without power? ›

How long can a micro SD card keeps the data without being powered, ignoring other environmental factors? Expect at least 10 years in ideal conditions (i.e. no physical damage by mechanical, chemical or electrical impact).

Why do microSD cards fail so often? ›

Why does SD card get corrupted? Some of the most common causes of SD card corruption include improper use, malware, accumulated bad sectors, manufacturing defects, and physical damage. The good news is that most cases of SD card corruption can be fixed without formatting.

How long do SD cards hold data? ›

Most SD cards won't retain data for more than about five years. The best practice for keeping your data safe is to copy it from your SD card to your computer as soon as you can.

How long does a 128GB SD card last? ›

Video Recording Time**
Recording speed24 Mbps17 Mbps
32GB160 min240 min
64GB320 min480 min
128GB640 min960 min
5 more rows
13 Sept 2022

How often should you replace SD cards? ›

You should replace SD cards at the first sign of problems, or every 2-3 years of regular use. That's because SD cards are prone to physical damage and wear and tear from use. They're an excellent temporary storage solution, but only for capture and transfer to another device like a hard drive.

Which lasts longer USB or SD card? ›

Just like USB drives, the SD card's lifespan is measured by write-and-erase cycles. This refers to the number of times data is copied to the storage device then erased. Most have a lifespan of around 10,000 write cycles.
SD Cards.
Bus InterfaceCard TypeBus Speed
SD ExpressSDHC, SDXC and SDUC985 MB/s
5 more rows
25 Jan 2021

Can you reuse a full SD card? ›

Today, you can buy memory cards that range in capacity from 8GB up to 256GB, 512GB and even 1TB or 2TB capacities. Memory cards are removable and reusable.

How can I make my SD card last longer? ›

How to Extend SD Card Lifespan?
  1. Choose (Multiple) SD Cards from a Reliable Brand. ...
  2. Never Force an SD Card into a Device. ...
  3. Don't Directly Edit Files on the SD Card. ...
  4. Safely Remove the SD Card from the Device. ...
  5. Don't Leave the SD Card in the Computer. ...
  6. Keep the SD card Clean. ...
  7. Back up Your SD Card to Another Storage Device.
18 Oct 2021

Can SD cards get viruses? ›

Mostly used in digital cameras and for additional storage on smartphones, SD cards are also connected to Macs and PCs to download photos or share other types of files. Sadly, it's possible to share viruses this way, too.

What are the disadvantages of a SD card? ›

Limited read/write cycles

As the SD card uses flash memory, there are limited read/write cycles. Solid-state drives and USB flash drives also follow the same pattern. Therefore the lifespan of an SD card is comparatively short.

Why are SD cards being removed? ›

Possible reasons for SD card unexpectedly removed

The SD card is broken or incompatible with the device. The SD card might be broken completely after long-term use. Different devices support different SD cards. The SD card will be removed if it doesn't match the type supported by your device.

How many times can you reuse a memory card? ›

Almost all modern memory cards can withstand at least 100,000 Program/Erase Cycles, and some cards can withstand as many as 10 times more cycles than standard cards. What this all means is that, according to the card manufacturers, you could fill a memory card every day for a couple decades without having any problems.

Can I use SD card from old phone? ›

Yes unless it is encrypted. Any SD card will work in any SD card enabled device. If you change your SD card any app specific data may be re downloaded (can eat at your data plan). You can easily encrypted the SD card but be aware you can not reverse the process without deleting the encrypted information.

How many raw photos can 128GB hold? ›

RAW vs JPEG Photos on Memory Cards

So, if a RAW file takes 30MB of space, it can fit in the memory cards as follows: 32GB = 1,092 photos. 64GB = 2,184 photos. 128GB = 4,368 photos.

Can SD cards be fake? ›

Counterfeit SD cards with reduced capacities should be avoided the most because they will most certainly result in data loss. 3. Fake Brand: Some SD cards have big brand labels attached to them and sold at a premium price when in reality they are made from cheap parts by some unknown manufacturer.

What is the difference of SD card and memory card? ›

Simply speaking, the SD card is larger and the Micro SD card is smaller. The specific size of the SD card is 24 mm x 32 mm x 2.1 mm, while the TF card is 15 mm x 11 mm x 1 mm. Therefore, it is inaccurate to call the memory card of the mobile phone SD card.

Which is faster SDHC or SDXC? ›

The SDHC card's speed capacity is up to 10MBps, while the SDXC card's speed capacity is up to 300MBps. Obviously, the latter is far faster than the former, which is also the reason that the SDXC card is usually offered to camcorder users.

Can I use a SDHC card instead of SD? ›

SD High Capacity (SDHC™) card is an SD™ memory card based on the SDA 2.0 specification. Because SDHC works differently than standard SD cards, this format is NOT backwards compatible with host devices that only take SD (128MB - 2GB) cards. Most readers and host devices built after 2008 should be SDHC compatible.

What is the difference between Class 4 and Class 10 SD cards? ›

10 is the fastest, while 2 is the slowest. While Class 2 is suitable for standard-definition video recording, Classes 4 and 6 are suitable for high-definition video recording, and Class 10 is suitable for “full HD video recording” and “HD still consecutive recording.

Is A1 or A2 better SD card? ›

The Application Performance Class 2 (A2) is defined by SD Physical 6.0 specification. It makes SD memory card much higher performance than A1 performance by using functions of Command Queuing and Cache.

Does it matter what brand of SD card? ›

Most genuine, brand-name microSD cards are fine most of the time, and there won't be a problem if you don't want to overthink making your choice. But for about the same price, some cards are a bit faster or offer a tad more reliability, which can make them more versatile and a better long-term value.

How much should an SD card cost? ›

On average, these memory cards are going to cost anywhere from $5 to $35; again, depending on the size. The SD and SDHC, which tend to be the most common and the cheapest, will cost anywhere from $2 to more than $15, depending on the capacity and the brand.

What cameras still use CF cards? ›

Cameras that use CF cards:
  • Nikon D850.
  • Canon EOS 5D Mark IV.
  • Canon EOS-1D X Mark II.
  • Canon EOS 5Ds.
  • Canon EOS 5DSr.
18 Jul 2022

Do I need a CFexpress reader? ›

CFExpress A cards cannot be read on any machine using an sd slot. You need an external CFExpress A reader.

Do I need a CFexpress card? ›

If you want to shoot continuous bursts in Hi+ Drive Mode with either uncompressed or compressed RAW files and not hit the buffer then you will require a CFexpress Type-A card.

How many photos can 64GB hold? ›

How many photos can a 64GB SD card hold? The average size of smartphone images shot in 12MP resolution works out to about 5.2MB. Using that figure, a 64GB SD card will be able to hold about 12,600 JPEG images.

What SD card do I need for 4K video? ›

If you're looking for the best SD card performance you can get for your 4K video, look for UHS-II cards with a V90 rating. These are all great solutions to the UHS speed class SD cards if your camera requires higher write speeds when recording in 4K or 8K resolution.

How many pictures can 16GB hold? ›

Depending on those factors, you'll be able to fit somewhere between 200 and 12,000 images onto a 16GB memory card. Typically, a 16GB sd card can hold around 2861 JPEG photos in 16 megapixels.

Which is faster SD card or SSD? ›

SD card typically ready somewhere in the 10-15mb/sec range, 20-30 if you're lucky. A SATAIII SSD can hit 500mb/sec. I guess it depends on the SD card and how one uses the card, but yeah, an SD card isn't going to come anywhere near a SSD.

Do high speed SD cards make a difference? ›

Similarly, having a faster SD card will support larger files and be quicker when processing them. The reading and writing speeds of an SD card are gauged by their megabits per second (MB/s or Mbps). You can see this number on the front of the card.

Which is better SD or microSD? ›

MicroSD cards are the smaller-sized version of SD cards and the biggest difference between the two is the form factor. They're also more versatile since they're often available with an SD adaptor that allows you to use microSD cards in hardware devices that only support SD cards.

Where are CF cards used? ›

Applications of CF card

CompactFlash cards are commonly used in digital cameras and camcorders. They are also used in portable music players and personal digital assistants (PDAs). Digital cameras that use CompactFlash cards include high-end DSLR cameras and some point-and-shoot cameras.

Do SDUC cards exist? ›

The SD Association has also created a newer specification known as SDUC, for Secure Digital Ultra Capacity. It has its own host technology, protocols, and drivers, but in terms of card storage capacity, it's designed to cover cards ranging from 2TB up to 128TB.

How long does a CF card last? ›

(4,000,000/24hrs)/365 days = 456.6 years. In theory the first CF failure should occur long after the product is obsolete. 64.7 years for the life span if using the entire drive.

Why are SD cards cheaper than CF cards? ›

For SD, the controller for reading the card resides in the reader and thus readers cost more but cards cost less (but are limited by the reader). For CF on the other hand, the controller resides in the card. This allows for some interesting things like the old Microdrives that were actual hard drives inside a CF card.

Do all memory cards work for all cameras? ›

Compatibility – Memory cards will only work if they are compatible with the proposed camera. For example, a MicroSDXC will only work in a MicroSDXC-compatible slot. UDMA Rating – (Ultra Direct Memory Access rating).

Do I need a CFExpress card reader? ›

Re: CFExpress Type A I need a special reader? Thanks for that info. CFExpress A cards cannot be read on any machine using an sd slot. You need an external CFExpress A reader.

How do I retrieve data from my CF card? ›

How To Recover Data From A Compact Flash Card
  1. Download, install, and open Disk Drill on your PC.
  2. Connect the CF card to your computer.
  3. Select your CF card and click on “Search for Lost Data”.
  4. Select the files you want to recover and click “Recover”.
  5. Choose the recovery destination and hit “Confirm”.
31 Jan 2022

What is the difference between a micro SD card and a microSDXC card? ›

MicroSDHC cards are microSD cards with at most 32GB, while microSDXC card have more than 32GB storage capacity. You can mainly use a microSDHC card to store media in Full HD quality and a microSDXC card for 4K images or large bulks. There's not much difference in terms of read and write speeds.

What is the difference between Type A and Type B CF Express cards? ›

CFexpress Type A is the smallest, measuring 20mm (width) by 28mm (length) by 2.8mm (thickness, including label area). The Type B cards measure 38.5mm x 29.6mm x 3.8mm, while the largest Type C cards measure 54mm x 74mm x 4.8mm.

What is the difference between a memory card and an SD card? ›

Memory cards are used to expand the storage capacity of mobile phones, SLRs, Dash cam, Drone and the other electronic products. Normally we refer to the memory card as SD card.

Is an SD card the same as a SIM card? ›

the SIM card comes from your cellular provider and is what provides your phone number to the device. the SD card can be purchased as an accessory, and it is what stores your external data such as pictures, songs, videos, applications, documents, etc.

What is the best SD card in the world? ›

The best SD cards 2022
  • SanDisk Extreme Pro SDXC UHS-I. ...
  • Lexar Professional 633x UHS-I. ...
  • PNY Elite Performance SDXC. ...
  • SanDisk Extreme PRO SDXC UHS-II V90. ...
  • Lexar Professional Class 10 UHS-II 2000X. ...
  • Sony SF-G Series TOUGH UHS-II. ...
  • Lexar Professional 1667x SDXC UHS-II. ...
  • SanDisk Extreme SD UHS-I V3.
20 Sept 2022

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