However, since the over provisioned blocks are out of circulation, they won't be used (or visible to software) again until they've already been overwritten.

A full drive overwrite wouldn't touch these blocks, which could have data in them. So there might be 5 or 10 percent of blocks that are unavailable to the OS at any given time. SSDs use overprovisioning to extend the life of the drive and replace any blocks that fail over time. Hard drives need multiple overwrites because magnetic media can leave remnants of data, but all SSDs have a limited number of write cycles so overwriting them multiple times will harm the drive's longevity and may not even wipe the files you want to get rid of. This brute-force overwrite method won't work as well for SSDs. The best way to erase an HDD, which we'll cover in more detail below, is to use a program that writes random data over all the sectors several times so that no remnants of the old files remain. Securely erasing an SSD is different than doing the same process on a mechanical hard drive.

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