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Ext3 and RAID: silent data killers?Ext3 and RAID: silent data killers?Posted Sep 1, 2009 0:00 UTC (Tue) by me@jasonclinton.com (subscriber, #52701)In reply to: Ext3 and RAID: silent data killers? by drag Parent article: Ext3 and RAID: silent data killers? Isn't the ATA/MMC<->MTD translation done in the consumer "reader" that you stick these devices in? CF is electrically compatible with ATA. That's not even remotely the case with the electrical interfaces on either SD or MS.
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Ext3 and RAID: silent data killers? Posted Sep 1, 2009 0:52 UTC (Tue) by drag (subscriber, #31333) [Link]
Maybe. I don't think so. At least not for SD.
Remember that SD stands for 'Secure Digital' and is DRM'd. So there has to be some smarts in it to do that.
Ext3 and RAID: silent data killers? Posted Sep 1, 2009 6:22 UTC (Tue) by Los__D (guest, #15263) [Link]
Almost no SD support the DRM features, according to Wikipedia.
(Still doesn't change the point, though. SDs are probably designed with internal firmware)
Ext3 and RAID: silent data killers? Posted Sep 1, 2009 9:36 UTC (Tue) by alonz (subscriber, #815) [Link] That's not what Wikipedia says—they say few devices support CPRM. Which is more-or-less true—almost no devices in the western market use CPRM, while in Japan every single device does (it is required as part of i-Mode, which is mandated by DoCoMo).As for firmware, the SD card interface (available for free at www.sdcard.org defines accesses in terms of 512-byte “logical” sectors, practically mandating the card to implement a flash translation layer.
Ext3 and RAID: silent data killers? Posted Sep 1, 2009 12:49 UTC (Tue) by Los__D (guest, #15263) [Link]
Doh, of course.
I read "devices" as the SD cards themselves.
Ext3 and RAID: silent data killers? Posted Sep 1, 2009 16:57 UTC (Tue) by Baylink (subscriber, #755) [Link]
Generally, I think that's true, yes; the only small-flash technology that actually *looks like an ATA drive at the connector* is CF; the others require a smart reader to do the interfacing -- which may itself *not* look like ATA at the back; there are clearly other better ways to do this stuff.
Ext3 and RAID: silent data killers? Posted Sep 1, 2009 17:37 UTC (Tue) by iabervon (subscriber, #722) [Link]
SD is MMC with a few extra features nobody uses. The readers do USB-storage<->SD, but SD is still 512-byte chunks (it's a card-reported value, and the host can actually try changing it, but 512 is the only value that is ever supported).
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