Use Disk Manager for problem determination

Disk Manager (named Disk Management in Windows® 11) is a system utility located in:

Control Panel
  System and Security (this level is shown only if View by is Category)
    Administrative Tools (Windows Tools in Windows® 11)
      Computer Management
        Disk Management

It can be used to determine the cause of the problem, as follows:

• If a drive is not shown in Disk Manager, it is not detected by the computer hardware. See "Drive undetectable by Disk Manager".
• If a drive is shown in Disk Manager but files are inaccessible, see "Corrupted drive".
• If a drive is shown in Disk Manager but hangs or drops offline intermittently, see "Drive hanging or dropping intermittently".

In the example above, disks 0, 1 and 3 are normal. Disk 4 may be uninitialized or corrupted. Any other disks not shown may have hardware or connection problems.