A Windows basic or dynamic disk’s status is Unreadable
The Unreadable status occurs when either a basic or dynamic disk is not accessible. The disk may have experienced hardware failure, corruption, or I/O errors. The disk’s copy of the system’s disk configuration database may be corrupted. An error icon appears on disks that display the Unreadable status.
In some cases, disks that appear as unreadable may be unrecoverable. To attempt to recover the disks attempt to rescan the disks or restart the system to update the disk status.
The disks may also be missing a valid disk signature
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