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eMMCeMMCPosted Dec 28, 2010 14:37 UTC (Tue) by pflugstad (subscriber, #224)In reply to: Ext4 filesystem hits Android, no need to fear data loss (ars technica) by timokokk Parent article: Ext4 filesystem hits Android, no need to fear data loss (ars technica)
I expect a lot of phones are using eMMC, due to it's lower pin counts compared to raw flash. eMMC presents a SCSI/block interface to the OS and so has it's own block translation and wear-leveling firmware which hides the underlying flash.
The problem with this is exactly that however - you're depending on the quality of the eMMC firmware, which can be dodgy. Look at the problems the SSD drives have had of falling off a performance cliff. Also, we've had issues with eMMC reliability from some vendors. I don't know if you can update that firmware on the fly or not.
We're to the point of putting bare NAND back on our boards and using UBIFS instead.
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eMMC Posted Dec 28, 2010 18:14 UTC (Tue) by mikov (subscriber, #33179) [Link]
We are experiencing the same kind of problems, only unfortunately using bare NAND is not an option for us. That's why it seemed strange to me that large manufacturers like Samsung would voluntarily use the worse solution.
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