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In Reply to: RE: OK, Thanks..... Would a USB Drive be more Reliable?........ posted by fmak on July 25, 2014 at 23:22:40
I suspect the cards work OK in cameras because the usage patterns, e.g. they don't write to the cards if the batteries are too low to complete the write and they don't shut off in the middle of a write.
I use these cards in a Raspberry Pi that is used to control some equipment. Most of the cards failed because of heavy write traffic, e.g. while doing an ArchLinux operating system update or by being powered down in the middle of a write. So far I haven't had any problems with a SanDisk Extreme SDHC UHS-1 card (8 GB) in my application but the Class 2 cards were junk.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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SD cards and thumb drives are not over provisioned like SSDs and do not implement rigorous wear leveling and do not directly support TRIM. It's quite conceivable that the same blocks are being written to excessively. Running fstrim occasionally might help.
The use cases for SD cards and thumb drives are quite different in cameras and other intended purposes. The read/write duty cycle of running a general purpose OS on an SD card would be relatively high compared to the duty cycle for it's intended use.
But regardless of media, everyone should maintain recent tested backups.
"But regardless of media, everyone should maintain recent tested backups."
Yes. Tested backups...
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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