Hence, it is not safe to fill zeros with SSD drive.' 1 it does reduce the endurance of the drive (by a bit) but mostly because its a waste of time, as it wont solve whatever issue you were trying to fix. If you make a mistake, you need to have good, recent backups ready. The frequent zero-filling operation will make it prone to damage and reduce its lifespan. It is a very handy utility but, be warned, it will never ask "Are you sure?" before obliterating a partition, and there is no undo. Twice I have found problems with USB sticks by doing this, and I was able to exchange them with the seller for properly working ones without any trouble after showing the results of the dd and subsequent disk checks. It allows me to completely scrub anything that might already exist on the drive while also testing write speed and looking for bad blocks. I generally run this command on all new storage devices when I first buy them. Once this process starts, it will go until either you cancel the operation with a Ctrl+ C, or the destination device runs out of space. Write in blocks of 4096 bytes at a timeĪnd, of course, there is no "undo".
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