Talk:SD card

This is the talk page for discussing improvements to the SD card article.
This is not a forum for general discussion of the article's subject.

Put new text under old text. Click here to start a new topic.
New to Wikipedia? Welcome! Learn to edit; get help.

Article policies

Find sources: Google (books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL

Archives: 1, 2: 12 months

SD card was nominated as a Engineering and technology good article, but it did not meet the good article criteria at the time (March 27, 2015). There are suggestions on the review page for improving the article. If you can improve it, please do; it may then be renominated.

Electronics Mid‑importance

	Electronics portal This article is part of WikiProject Electronics, an attempt to provide a standard approach to writing articles about electronics on Wikipedia. If you would like to participate, you can choose to edit the article attached to this page, or visit the project page, where you can join the project and see a list of open tasks. Leave messages at the project talk pageElectronicsWikipedia:WikiProject ElectronicsTemplate:WikiProject Electronicselectronic
Mid	This article has been rated as Mid-importance on the project's importance scale.

Computing Mid‑importance

	This article is within the scope of WikiProject Computing, a collaborative effort to improve the coverage of computers, computing, and information technology on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.ComputingWikipedia:WikiProject ComputingTemplate:WikiProject ComputingComputing
Mid	This article has been rated as Mid-importance on the project's importance scale.
	This article is supported by Computer hardware task force (assessed as High-importance).

Photography Mid‑importance

	This article is within the scope of WikiProject Photography, a collaborative effort to improve the coverage of photography on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.PhotographyWikipedia:WikiProject PhotographyTemplate:WikiProject PhotographyPhotography
Mid	This article has been rated as Mid-importance on the project's importance scale.

‹ The template below (Copied) is being considered for merging with merged-from. See templates for discussion to help reach a consensus. ›

Text has been copied to or from this article; see the list below. The source pages now serve to provide attribution for the content in the destination pages and must not be deleted as long as the copies exist. For attribution and to access older versions of the copied text, please see the history links below.

Merged MiniSD (history) → SD card
Merged MicroSD (history) → SD card

X Speed Ratings: SLC vs MLC,?

Probably, a thing related to speed ratings of SD cards is the SLC vs MLC issue. Although it is almost never mentioned by SD cards distributors, it seems the critical factor impacting access times, write and read speed, as well as the media durability. I'm absolutely not any kind of expert here, I just wanted to give a hint, hoping it's usefull for soemone more knowledgable. I can't say what is the link between 60, 133, 150x etc. ratings and the SLC/MLC, but there is something on here it seems. Or are the MLC not present on the market anymore?

Searching for "slc mlc sd" gives eg. this document: The Samsung SLC NAND Flash Advantage.

Compatibility section

I think there should be a separate section on compatibility, e.g. between SD and MMC cards, the issue with 128 GB and larger SD cards, etc.

performance-loss with reformating

In SDUC > exFAT filesystem, it is mentioned twice that one can reformat the card. It is however not mentioned that one needs to know the exact specs (like allocation unit size and erase block size) of an SD-Card to do so, or lose up to 50% performance. Said specs are usually not profided by the vendors, even if asked, you have to guess them with flashbench.

Bad article format

The "History" section of this article is useless garbage, because it persistantly references terms and acronyms which are not defined until much later in the article. The article should be reformatted to move history to the end, so that the reader knows what the different terms mean. — Preceding unsigned comment added by 2601:589:300:C7C0:21A1:13AE:687F:5058 (talk) 20:03, 24 March 2024 (UTC)[reply]

Incomplete, or bad English syntax statement?

The statement "Without they are guaranteed to at least reach A1 speeds", in the 16:11, 25 April 2024‎, version (https://en.wikipedia.org/w/index.php?title=SD_card&oldid=1220735921) of this article, doesn't make sense. The statement is found under the Speed section (section 3), Class subsection (subsection 3.2), "Application Performance Class" sub-subsection. Did the author/editor perhaps mean to write something like "Without host driver support, A2 cards are guaranteed to at least reach A1 speeds"? Mercy11 (talk) 10:05, 26 April 2024 (UTC)[reply]

SD 7.0 does not support UHS-II/IIIcards

SD Express cards cannot support UHS-II interface. SD7. 0 and SD7. 1 define full size SD and microSD form factors using two power supplies, a traditional 3.3 volt and 1.8 volt. 112.104.98.124 (talk) 08:33, 9 October 2024 (UTC)[reply]