Ejecting USB drives while in the Windows Recovery Console / System Recovery Command Prompt, so it is unlikely any of the utilities above will help. In such a situation, the following method using Diskpart should work:
- Type
diskpart
and wait for the diskpart prompt (DISKPART>
) - Type
list volume
- Note the volume number of the USB drive carefully (use listed properties such as drive letter, label, type and size for help)
- Type
select volume <number>
, where<number>
is the volume number noted above - Type
remove all dismount
- Type
exit
to quit Diskpart
Now you should be able to safely remove your USB drive without fear of data loss.