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class type[edit]

I believe the different class the micro sdhc cards are divided up into are how fast they transfer/load. I'm not too sure as I've forgotten but I believe its somewhere along those lines. The higher the class the faster I think. Correct this post or add it as I might be mistaken. (talk) 23:56, 31 August 2010 (UTC)some guy


Removed A1010 from list of Supported Devices, as it has been canned. Admiral Trigger Happy 03:22, 17 March 2006 (UTC)


It's so small! One question, does the name TransFlash always mean microSD, or is it a technology available to any flash card maker? [[User:J I think its a mistake, but its generally difficult to prove the nonexistence of something. M0nkey 15:28, 4 June 2006 (UTC)

No 2GB microSD[edit]

Edited article to correct the error.

I have a 2 gig micro sd card in my Verizon LG VX8300 right now. I'm listening to the one of my 389 songs as I type this.

It exist: "Card capacity up to 2GB" 12:11, 18 October 2006 (UTC)

i have a 512 mb transflash —Preceding unsigned comment added by (talk) 11:33, 5 November 2010 (UTC)

Micro SD -> Mini SD[edit]

No information if it is possible to use micro SD cards on devices with mini SD slots.

This is true. Likely this is because there is no information anywhere on that. — Saxifrage 22:07, 26 September 2006 (UTC)

a micro sd to mini sd adaptor can be found at [1]

Can we have an update to the list of converters/adapters available, to include xD card adapters? I bought an Olympus camera recently, and this came with a microSD to xD adapter. —Preceding unsigned comment added by (talk) 14:13, 20 December 2008 (UTC)

Do remeber that the Olympus adapter only makes up the pins from the camera to the microsd. This works because Olympus cameras now have SD access logically on the firmware, so that only the passive adapter is needed. (talk) 19:13, 4 January 2009 (UTC)

Computer Interface?[edit]

If I have a MicroSD card, how do I write stuff to it? The device that uses the MicroSD card doesn't interface with a computer.

Most MicroSD cards come with an adaptor that looks like a normal SD or MMC card with a small slot in the top for the MicroSD card. Since the cards are technically the same apart from case size, it's just a connector adaptor. The adaptor can then be put into a normal SD/MMC card reader. If you didn't get one with your card, I don't know what to suggest. I suppose complain to whoever you got the card from, or see if your local electronics store sells the adaptor (it shouldn't be expensive: it's just some plastic and a few wires). — Saxifrage 22:06, 26 September 2006 (UTC)
At Spain exist a microSD / miniSD USB dongle adapter (only one model for dongle). At Auchan /Alcampo Hipermarket have a price of 9 € --Museo8bits 09:20, 24 December 2006 (UTC)
The best way is with a SanDisk/MicroSD converter (where the MicroSD fits into a SanDisk type casing), and subsequently functions as one. Once the MicroSD is in place, there's no difference. Here's an image of one [2] (I ignore the MiniSD component which is also shown entirely, as well as the "phone" jargon sticker, since this works on anything that takes a SanDisk): You just slide the MicroSD into the SanDisk casing (usually there's a lock on the side so it doesn't slide out) and you're done! Other products that take MicroSD cards, such as cell phones, etc probably work too. I hope this helps! jeff (talk) 16:13, 2 May 2008 (UTC)


Are there several standard voltages for microSD ? Some people talk about it, but I can't find anything with google, just a single voltage of 3.3V. Some manufacturers state 2.7V-3.6V.

xerces8, -- 13:48, 9 January 2007 (UTC)

You're thinking of RS-MMC/DV-MMC, which has two voltages. Wibbble 19:47, 9 January 2007 (UTC)
No I´m a not ;-) --Xerces8 10:01, 24 January 2007 (UTC)

microSD vs microSDHC[edit]

Can someone give definitive info on if devices which support microSD will also support microSDHC automatically? or are microSDHC like SDHC, your device needs explicit support of the interface? --Auroragb 18:22, 15 August 2007 (UTC)

Well, I encountered stuff that takes microSD cards, but doesn't support microSDHC. So I am pretty sure it's NOT automatically compatible. —Preceding signed but undated comment was added at 02:41, 21 September 2007 (UTC)

Most products I've encountered are compatible, provided they're less than a year or two old (SDHC = SanDisk High Capacity in case anyone was wondering). If it's not too expensive, I suppose anything's worth a try! jeff (talk) 16:19, 2 May 2008 (UTC)

SD = Secure Digital not SanDisk —Preceding unsigned comment added by (talk) 21:14, 31 March 2010 (UTC)

All SDHC devices will accept both SD and SDHC media. SD devices will only accept SD media. Keep in mind that devices have a memory limit as well as media type specification. Happy01000101 (talk) 09:03, 10 May 2010 (UTC)


Is microSD compatible with Memory Stick PRO Duo, and is there an adapter? 08:57, 29 September 2007 (UTC)

Not compatible natively, the adapter does some translation. There are questions about whether it supports MagicGate, but for non-DRM storage, it's known to work. See (talk) —Preceding comment was added at 20:39, 16 April 2008 (UTC)

note 2 is note 5[edit]

This is my first contrib to wikipedia, but I noticed that note 2 in the body of the article is listed as note 5 at the bottom (there are only two footnotes). Also the URL it goes to is to a commercial site, and doesn't mention the device it claims to footnote, so does that make it just bogus? (talk) 12:39, 12 December 2007 (UTC) (suppose I should get a username if I'm to contrib, eh?)

This article and the SHDC article conflict[edit]

This article states that the maximum capacity of a MicroSD is 4 GB where it, in the SHDC article, states that SHDC is the first card to go over 2 GB. Does any one know which one is correct? I think it's the SHDC one since i haven't been able to locate a MicroSD card with more than 2 GB. EZtaR (talk) 00:57, 9 January 2008 (UTC)

16Gb MicroSD[edit]

This article states that as of March 2008 MicroSD cards are available in a capacity of 16GB. I am unable to find this capacity on SanDisk's product page or in any of the article's external links. Marking the statement with {{Fact}} until a reference is available. -SpazzTH (talk) 22:44, 8 April 2008 (UTC)

I think it's just plain wrong. I changed it to 8GB; someone can change it back if they find a reference to back it up. As the article notes, 12GB cards are in the pipeline. — Johan the Ghost seance 21:24, 9 April 2008 (UTC)
I changed it again - 8GB is fact, 16GB is target of Sandisk, they are working on it. Cool. Flyingbird (talk) 20:07, 25 April 2008 (UTC)
I can't wait for 16GB (or 32GB looking a little further into the future) MicroSD cards to become available, and it DOES look like 16GB is coming very soon, but I'll have to agree with the above poster(s). We can't just announce the arrival of 16GB because we're excited about them, as long as we intend on keeping the encyclopedia format. But I think this is a good place to talk about them and what the "word on the street" is without changing the article itself. jeff (talk) 15:55, 2 May 2008 (UTC)
I changed it from 16GB to 8GB. I know I'm not the first person to do this. Is someone removing the change? Zipdude (talk) 15:33, 20 September 2008 (UTC)
SanDisk start levering micro-sdhc-kaart van 32GB on april 2010 -

NFC claim dubious[edit]

The Phonescoop link cited to back up the assertion that MicroSD cards support NFC appears poorly worded. What I think they mean is "MicroSD cards can also operate in SDIO mode, like full-size SD cards. This enables non-memory cards to be created, like wifi, bluetooth, GPS, or NFC."

Two problems with the way it's worded now: First, nobody's built a MicroSDIO NFC card. Second, nobody asserts that TransFlash does not support SDIO. I'm changing it, pending some clear evidence to the contrary. (talk) 20:43, 16 April 2008 (UTC)

What are the discounts of this microSD card ?[edit]

Please say me what are the discounts of this card ? Which legs does extend Input signal, on who is databases information, and any other. thanks !

[BG] → здравейте всички. Много ви моля кажете ми какви са изводите на тази карта. На кой крака се подава входен сигнал, по кой текът базовите данни.


Performance (read and write speed) of microSD devices is a jungle. Most cards does not specify. I have found that in practive there may be significant differences. This area needs to be covered by someone who is not as confused as myself. -- Egil (talk) 12:21, 2 September 2008 (UTC)

microSD & SDHC[edit]

Currently, the article says "As of August 2008, microSD cards are available in capacities from 64 MB to 8 GB.[citation needed] A 12 GB version is being developed by SanDisk.[citation needed] Cards 4 GB and larger are only available in the newer SDHC format." So There's an 8 GB microSD ard available, but cards 4 GB and larger are only available in SDHC format? Er... Which is it? Somebody pick one, please? —Preceding unsigned comment added by (talk) 13:43, 22 September 2008 (UTC)

I agree with this observation...I think the "only" modifies the wrong thing. Did you mean "in SDHC format"..."cards" are "only available"... "4GB and larger"? (I don't have time to research this, perhaps someone who knows can answer it :-) (this comment is Signed... :-) Pachai (talk) 03:27, 19 October 2008 (UTC)

No, the inference is that SDHC is microSD card. You will not find any low capacity SD cards with 8GB. It is like in the old days there was IDE, then they came out with IDE2 and eIDE, but even now that they are so far beyond these ancient protocols, it is still called "IDE". Happy01000101 (talk) 09:45, 10 May 2010 (UTC)

Devices list[edit]

I've noticed that the devices list is getting ridiculous. Is it not sufficient to say that it is pretty much the standard for most phones released? Not to mention the other types of device that use it. It seems impossible to create a complete list like this and I think it should be completely removed, and replaced with some text saying how widespread it's use is. ColinCameron (talk) 18:09, 26 November 2008 (UTC)

True, it is impossible to list all devices, but some general guidelines would be helpful. For example, the LG VX8300 was a very popular phone using a micro SD card, but you can't just stick an 8GB card in there. I think the highest is 1GB, unless you do special formatting (difficult on a phone)and then you can get up to a 2GB card in there. That type of information would be helpful. Also, some people sell cards as "approved for cell phone use" at much higher prices, even though they are the same capacity. Is this a canard? Or is there truly a difference? There is still MUCH confusion over the relatively simple aspect of sticking a card in a slot. —Preceding unsigned comment added by Carl2222 (talkcontribs) 08:15, 7 February 2009 (UTC)

max capacity[edit]

intro section mentions 16GB as max capacity, while the reference clearly states the new 16GB is microSDHC, not microSD. Apparently the confusion spread to the article itself, if I understand things correctly. The largest microSD card at present is 2GB, can anyone confirm? (talk) 04:12, 26 December 2008 (UTC)

There are basically two versions of MicroSD... the physical card itself looks exactly the same. Older devices that originally supported MicroSD only support the NON-SDHC cards. Cards 4GB or larger only use this new SDHC tech. This is the general rule, certain devices my also be only compatible with certain sizes also. In theory, if a device supports SDHC it should support larger capacities going forward regardless of size. (It probably becomes more of a software issue if it doesn't.) Psilocybin (talk) 08:12, 26 December 2008 (UTC)

In the intro to this section, it lists cards as "available" up to 32gb. Can anyone source this? All the information I can find says that they are only available up to 16gb as of 2/16/10. —Preceding unsigned comment added by (talk) 16:46, 16 February 2010 (UTC)

open source compatible?[edit]

what does it mean? any memory medium can store any data, be it open source or closed source. so what does the field 'open source compatible' in the comparison table mean? Perryizgr8 (talk) 17:25, 23 May 2009 (UTC)

It's not about content (storing software on the drives) but access drivers. MMC has been in Linux kernel for ages, SD readout capabilities are recently new even though they were written a long time ago - but available only as 3rd party patches. It took many years till they made into the trunk. It's about proprietary specs covered by NDA. You are not allowed to release source code of a program implementing these specs. Of course if you never signed the NDA, it means you can reverse-engineer the protocol and write your own stack, getting the driver into kernel. But by doing so you put big companies that supporters of Linux (like IBM) in a very uncomfortable position: they DID sign the NDA to be able to use the device in their other products, and now if they release Linux, they are required (by GPL) to release the source code - and the source code contains the implementation of the stack (reverse-engineered but still compliant with the secret spec.) - so publishing it is in violation of the NDA, so they would have to remove the offending code from kernel prior to release. (talk) 14:18, 1 June 2009 (UTC)

Any card column that can do CPRM I believe should say "User Area = Yes, Protected Area = No" on the "Open Source Compatible" box. This is because in theory someone could write open source CPRM functions to do this, they would also need a symmetric key issued by the 4C. I don't know if this is possible because of the nature of Open Source. BTW, I know of no Open Source Projects to implement CPRM on SD cards. —Preceding unsigned comment added by (talk) 22:43, 1 July 2009 (UTC)

4 Bit transfer mode optional or not?[edit]

The article says that "All memory cards must support all three modes [1 Bit, 4 Bit and SPI], except for microSD where SPI is optional." Though the tables in the miniSD card and microSD articles state that 4 Bit mode is optional for all form factors. Now what? -- (talk) 10:00, 3 September 2009 (UTC)


The article doesn't mention the "class" rating for, specifically, microSDHC. I've see class 2, 4, and 6. I was hoping that wiki knew what it all means. Once I learn, I'll consider updating the article. Charles 11:20, 12 September 2009 (UTC)

That would be great. I was looking for this information too. (talk) 01:31, 23 June 2010 (UTC)
I second that. I can't find any info as to what it means, specifically compatibility-wise. Darktangent (talk) 21:43, 23 September 2010 (UTC)

use of the word similar[edit]

"The SD and SDHC share a similar form factor, but not all devices are compatible with the newer high capacity format"

Surely they share identical form factor? —Preceding unsigned comment added by (talk) 21:09, 31 March 2010 (UTC)


"This is even true with devices that have been developed by SanDisk such as their e200 series of MP3 players. Using 3rd party firmware, however, SDHC reading capabilities can be possible.[3]"

I don't see why Sandisk should be highlighted here. —Preceding unsigned comment added by (talk) 21:13, 31 March 2010 (UTC)

Removing Cards[edit]

I'm new to this memory format and noticed that on some hardware (cameras) the stick "clicks in & out". But on other hardware (smartphones) the stick does "click in", but cannot be removed so easily. You have to use a tool (tweezers, or a very thin edged tool like a razor blade) to gently pry the card out. I would post this directly into the article, but I'm not sure if this is accurate, follows "best practices", etc. If anyone knows better, I would suggest updating the article. (talk) 04:22, 22 June 2010 (UTC)


SbmeirowTalk • 22:07, 30 January 2011 (UTC)

I finished merging this article MicroSD to Secure Digital. • SbmeirowTalk • 15:39, 27 February 2011 (UTC)

Failure of the Microsd cards[edit]

It is observed that the cards used in smartphones and tablets do get corrupted and become useless. The reasons and care to avoid corruption are not mentioned any where in the article on the memory cards. Some body mentions that the cards support 10000 cycles. How far are these indisputable? — Preceding unsigned comment added by Sscharyulu (talkcontribs) 04:33, 13 March 2013 (UTC)