Messages in this thread | | | Date | Thu, 2 Jun 2005 12:17:59 +0300 | From | Jarkko Lavinen <> | Subject | Re: Writing large files onto sync mounted MMC corrupts the FS |
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On Thu, Jun 02, 2005 at 10:52:57AM +0400, ext Artem B. Bityuckiy wrote: > So, we should first ask whether this happens with *new* MMC cards or not.
Flash manufactorers typically claim 100k erase cycles -- some even 1M. If FAT is updated after each written 512 byte block, filling 64MiB card in synchronous mode would cause over 100k FAT updates. One couldn't even fill a new 64MiB card without already breaking it.
With asynchronous mount, one could limit the dirty_ratio from proc to reduce the sync time against sudden power loss. But wouldn't this have the same adverse wearing effect as with synchronous mode once the dirty_ratio is hit and writing still proceeds?
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