Talk:Secure Digital

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Proposal to include section on standards adherence[edit]

Upon reading this, I find that these values are idealized and gathered from specification documents. In practice, however, I have found it extremely rare for a device to actually adhere to the stated writing speeds. I recently bought a card from a prominent global brand and by using the Linux application dd (Unix) to pipe massive amounts random data sourced from a file to the card, I have only seen one card that actually delivered as promised (using a 4GiB card back in 2007). I think a detailed and reproducible description of the evaluation and certification procedure would also be a valuable addition. Timothy D Legg, 87.138.223.233 (talk) 08:23, 30 May 2017 (UTC)

X Speed Ratings: SLC vs MLC,?[edit]

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[edit]

I think there should be a separate section on compatibility, e.g. between SD and MMC cards, the issue with 2GB and larger SD cards, etc.


Technically irrelevant table row?[edit]

(INAL) In table "Comparison of technical features of MMC and SD card variants", the row "Open-source compatible" DO NOT make any sense at all. — Preceding unsigned comment added by Kuldeepdhaka (talkcontribs) 20:59, 16 April 2017 (UTC)

Does this article Say anywhere[edit]

that the maximum capacity of an SDSC card is 2GB? Because if it does i can't see it. And it should. Flagpolewiki (talk) 16:29, 23 November 2017 (UTC)

it's in the upper-right infobox. • SbmeirowTalk • 16:50, 25 November 2017 (UTC)