Wiping a flash drive

I recently had a flash drive I formatted in Windows.

After the format, I ran Recuva, which found 0 files.

I did a deep scan, & it brought up a lot of files that were in excellent shape, & a test recovery of one turned out great.

After recovery, I used CCleaner wiper on the flash drive, then tried Recuva Deep scan & 0 files turned up.

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I feel much better turning my drive over to someone else to use it now, but do you trust wiping it 100%?

Especially with flash drives having spare cells for bad blocks, etc? I don't believe I had bad blocks, but you never know!

I didn't have anything really private on here, but if someone had pics of their wife or husband, etc, or personal pics, would you trust a full wipe of a flash drive enough to give the flash drive away? I have since moved to a bigger flash drive, & no longer need this one.

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Would love to know what the opinions are here!

As superb as CCleaner's 'Wipe Free Space' is confirmed by a Recuva 'Deep Scan' I personally wouldn't worry about any recovery, especially on removable media which doesn't those locked in MFT issues that hard disks do.