Disk state empty

After decommisioning of an unused CX3 storage we are reconfiguring an old CX4-120 for backup replication purpose.

CX4 had initially:

- enclosure 0 with 15 disks (450GB FC STE45085 CLAR450 disks)

- enclosure 1 with 15 disks (1TB SATA II WD1002FBCLAR1000 disks)

We are trying to switch to:

- enclosure 0 with 7 disks (450GB FC STE45085 CLAR450 disks) and 8 disks (1TB SATA II WD1002FBCLAR1000 disks)

- enclosure 1 with 15 disks (1TB SATA II WD1002FBCLAR1000 disks)

All LUN, storage groups, etc have been unbound

Drives changed one at a time

All changed 1TB drives are not regognised and slot marked as EMPTY

Can you please suggest me a command/procedure to reset/initialize the slots that doesn't recognise the 1TB drives?

The same drive inserted in enclosure 1 (same drive type and firmware) is perfectly recognized

Thanks very much

Filippo