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I tried the command “$ sudo lsof | grep /Volume/Macintosh\ HD” but it resulted in nothing, I just got a reset terminal after it prompted me for my password. Thank you for the additional assistance but I’m not quite sure what to do with any of this. Map auto_home on /home (autofs, automounted, nobrowse)įilesystem Size Used Avail Capacity iused ifree %iused Mounted on Map -hosts on /net (autofs, nosuid, automounted, nobrowse) dev/disk0s2 on / (hfs, local, journaled) Typing “mount” and hitting Enter yielded: Again, if the disk throwing the errors is the same as the primary boot partition that Recovery is also on, the above. Go to First Aid to verify and repair the disk, or go to Erase to format the disk.
MAC DISK UTILITY SECURE ERASE TIME MAC
Typing “/Volumes/” and hitting Tab once yielded “Macintosh HD” Tab a second time did nothing.Ģ. Reboot the Mac holding down the Option key and choose the Recovery partition. This means, however, that even if you try to overwrite a file, there’s no guarantee the drive will actually overwrite it, and that’s why secure deletion with SSDs is so much harder.1. All of this occurs at a very low level in the electronics of the disk, so the operating system doesn’t even realize it’s happened. This is kind of like leaving the page in the book unchanged, writing the modified file on a different page, and then just updating the book’s table of contents to point to the new page. As a side effect, sometimes instead of erasing and writing the block a file was originally stored on, the drive will instead leave that block alone, mark it as invalid, and just write the modified file to a different block. To counteract this, SSDs and USB drives will try to make sure that the amount of times each block has been erased and rewritten is about the same, so that the drive will last as long as possible (thus the term wear leveling). Each block can only be erased and rewritten a limited number of times before that block just won’t work anymore (the same way if you keep writing and erasing with a pencil and paper, eventually the paper might rip and be useless). But in SSDs and USB drives, erasing and re-writing the same block can wear it out. If you wanted to overwrite the file, then all you would have to do is tell the disk to overwrite those blocks. When a file is written to disk, it’s assigned to a certain block or set of blocks (pages). The space on every disk is divided into blocks, kind of like the pages in a book. At a high level, wear leveling works as follows. Macos Disk Utility Secure EraseĪs we mentioned above, SSDs and USB flash drives use a technique called wear leveling. This means, however, that even if you try to overwrite a file, there’s no guarantee the drive will actually overwrite it, and that’s why secure deletion with SSDs is so much harder.
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As we mentioned above, SSDs and USB flash drives use a technique called wear leveling.