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Plug in external drive grayed out

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Trying to make a rescue disk to thumb drive but the selection is grayed out.  I can see the drive in Windows Explorer.

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Bob, any thumb drive / USB stick needs to be 32GB or less in size and formatted as FAT32 to be available to use for rescue media.

Sorry Bob, but your image shows a 2GB stick with 2 partitions which is not recognised as the first partition is only 32MB and is too small for rescue media.

Run the following commands for this flash drive from an Administrator Command prompt.

Preparing USB drive for use by Acronis using Diskpart
diskpart
list disk   (to identify USB drive, i.e. 1)
select disk 1
clean
create partition primary
active
format fs=fat32 quick
assign
exit

Please be very carefull when selecting the disk as diskpart does not ask if you are sure and will wipe the selected disk!