To zero-fill a hard drive, use the following command at the Windows command prompt. Zero filling makes it impossible for someone to recover data from the hard drive that was overwritten. # I wrote files to it in the finder, and pressed eject in the finder.The zero-fill format option is only available in Windows Vista and later.įor a more thorough erasing of data on a storage drive or device, you can zero fill it, overwriting all data on the hard drive with zeroes. # This is when I got the Unable to be repaired dialog box Mount_msdos: /dev/disk2s1s10 on /Volumes/LAMBLIN: Permission denied Lamblincl5116:~ lamblin$ sudo mkdir /Volumes/LAMBLIN Mkdir: /Volumes/LAMBLIN: Permission denied Lamblincl5116:~ lamblin$ mkdir /Volumes/LAMBLIN Mount: realpath /Volumes/LAMBLIN: No such file or directory Lamblincl5116:~ lamblin$ sudo mount -w -t msdos /dev/disk2s1s10 /Volumes/LAMBLIN Lamblincl5116:~ lamblin$ diskutil umount /dev/disk2s1s10 Umount(/Volumes/LAMBLIN): Resource busy - try 'diskutil unmount' Lamblincl5116:~ lamblin$ sudo umount /dev/disk2s1s10 # Here I realized that the device name was unusual. Mount_msdos: /dev/disk2s1 on /Volumes/LAMBLIN: Resource busy Lamblincl5116:~ lamblin$ sudo mount -w -t msdos /dev/disk2s1 /Volumes/LAMBLIN Lamblincl5116:~ lamblin$ diskutil unmount /dev/disk2s1 Lamblincl5116:~ lamblin$ sudo gpt show -l /dev/disk2 lamblincl5116:~ lamblin$ sudo dfįilesystem 512-blocks Used Available Capacity iused ifree %iused Mounted on Well, I was able to mount it read-write with the following terminal fun, but after mounting it I got a dialog that said Repair failed, unable to repair this drive, it has been mounted read only for you to retrieve files from it, but you will not be able to write to it.Īnd then I could write to it. I wish they made these with A and C sides. Only one side can be used at a time, both access the 32Gb FAT32 storage. The only other odd thing about the USB stick is that it has one USB A side and one Micro-USB OTG side. I did manage to remount it read-write as shown below, but rebooting (though frustrating) behaves better and feels safer than doing it the other way and getting messages about it being damaged. There's no physical switch for disabling the read, but I suspect that somewhere Mac OS thinks that switch is enabled and somehow it doesn't check when it's booting. If I insert the drive after the machine has booted it will always mount read-only. I find the (almost) ONLY way I can mount it read-write in 10.12 Sierra or 10.13 High Sierra is to reboot the machine with the drive inserted. I have a similar USB stick in FAT32 format that's 32gb total. Have you tried rebooting with the drive in the USB slot? You should now be able to see that you were able to create the tmp.txt file on your USB in the Finder app or by:.Validate that the USB is now writeable:.Sudo mount -w -t msdos /dev/disk3s1 /Volumes/$NAMEĮxample: sudo mount -w -t msdos /dev/disk3s1 /Volumes/MIXTAPE Now create the Volume directory - this appears to be the key!. Output is: Volume MIXTAPE on disk3s1 unmounted In this case, NAME=MIXTAPE and the IDENTIFIER=/dev/disk3s1Įxample: sudo diskutil unmount /dev/disk3s1 Output is: /dev/disk3 (external, physical):
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