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I own an Android device with a removable MicroSD card. The card uses either FAT32 or ExFAT technology. These are "non-journaling filesystem" technologies, so the data on the cards can become corrupted in certain cases.

Perhaps I should run a consistency check (e.g. fsck / Chkdsk / ScanDisk) every so often.

A) How often should I run a consistency check on my MicroSD card?

B) Also, if my device sometimes freezes and I must power it off using the power button, must I run a consistency check every time?

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Usually you don't need to run consistency checks on filesystems manually. vold runs filesystem check (fsck.exfat or fsck_msdos) everytime before mounting a supported filesystem (including exFAT and FAT[N]) on secondary external storage.

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