from an admin-enabled account, in Terminal.app, see whether
sudo diskutil reformat {volume name goes here}
will work for you or not.
Other possible diskutil options can be seen by simply typing diskutil, with no qualifiers, at the command prompt
Also, man diskutil will give you the 'unabridged' version of diskutil's help, complete with several examples.
Lastly, you might want to do a
sudo ls -dl {volume name goes here}
to check and see who 'owns' the drives, and what are their read/write permissions, and change them appropriately, e.g.,
sudo chown root {volume name goes here} and
sudo chmod 1775 {volume name goes here}
(the volume name of a secondary drive will be /Volumes/whateverYouNamedIt)

Mac Flash Drive To Pc

May 16, 2007 7:21 AM Mac os x for intel pc iso.

Label the NTFS drive you want to use with a one-word name. Launch a Terminal open by pressing Command and the Space Bar at the same time. Type “Terminal” and hit the enter key. You can also open Terminal by going into Applications, then to Utilities, and finally, Terminal. Once you are in Terminal, type the following line of code.

Mac Flash Drive To Pc

All Windows and Mac computers comes with an in-built format disk option to erase everything from a USB flash drive. We will show you how to use this feature as your advantage to make sure everything is deleted permanently. Insert the USB flash drive to the computer and let the PC detect it. Open 'My Computer' and right-click on.
Best free data recovery software for Windows & Mac: I am not responsible for any data loss, I did say make sure you have every.
Question: Q: Brute force format drive w/ Terminal? I have an Intel iMac. I have two drives I want to erase, but Disk Utility won't let me erase them (one is a Windows NT volume, the other is 1/2 of an old RAID volume).
As simple as the process seems, it tells you a lot about your system. For example, if a USB flash drive that contains a bootable copy of macOS doesn’t show up on the Startup manager, you may need to repair the disk permission. Also, remember to format the USB drive with a APFS or Mac OS Extended format.

Format Flash Drive Mac Terminal