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I'm using several SD Cards to continuously write data from different sensors on an embedded device. I noticed that all of them after some days have a couple of Mb which are not visible (even if the Show hidden files option is enabled)

not-empty-1

not-empty-1

After I format it it looks like this:

after-format

https://i.sstatic.net/I3NIJ.png

What could be the cause ?

Thank you.

ossx
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3 Answers3

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It seems that for some reason there are some broken files on the SD Card (created either by the embedded device or by Windows when the data files are removed)

Using chkdsk Drive: /F made the files visible and available for deletion.

[I would add a picture but I am not allowed as I don't have enough reputation]

ossx
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All file systems have some overhead. FAT32, NTFS, EXT, HFS, etc., all use some of the storage space in the drive for their own use.

Caturday Saint
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Format the usb then install this http://www.softpedia.com/get/System/Boot-Manager-Disk/Bootice.shtml and follow this fix

Worked for me.

Community
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Faisal
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