Data

The disk is being used for data storage.

Spare

The disk is configured as a hot spare.

Free

The disk is not in use.

Cache

The disk is being used in the SSD cache.

None

There is no disk in the drive bay.

Warning

QuTS hero has detected S.M.A.R.T. errors. Run a full S.M.A.R.T. test and a disk scan.

Error

QuTS hero has detected I/O errors. You must replace the disk immediately.

Safely Detached

The disk's storage pool or expansion unit was safely detached from the NAS.