If its new, you may need to format it (external disk i mean) go to disk management under computer management under administrative tools in control panel. you should see all disks there, the one you want may be 100% unallocated space, put new partition over entire disk and so on...
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If its new, you may need to format it (external disk i mean)
go to disk management under computer management under administrative tools in control panel. you should see all disks there, the one you want may be 100% unallocated space, put new partition over entire disk and so on...