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USB stick checkup - is heavy daily use taking its toll?

I have been using a run-of-the-mill 8GB SanDisk Cruzer Micro for nightly
backups for c. 6 months and I am curious as to wear and tear.

The smartctl utility does not give me much information: "SMART Health
Status: OK" + a cryptic "Read defect list: asked for grown list but
didn't get it" - I don't get it either..

I thought I'd run an e2fsck with the -c "badblocks" option.. took two
hours and returned zero errors. 

But come to think of it, I'm not sure whether running e2fsck makes any
sense in the first place.. in other words, does some smart technology
live on the USB stick way below filesystems that might "mask" such
goings-on anyway?

Just curious how fast my stick is deteriorating ... how soon will I have
to consider budgeting another..



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