Avago Technologies 3ware 9650SE-12ML (Channel) - Manual (Page 249)

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After deletion, the operating system is notified that the unit was deleted. In
Linux the device node associated with this unit is removed. In Windows the
Device Manager will reflect the changes under the disk drives icon.
Available Drives (to Create Units)
This section lists the drives on the controller which are not currently
configured as part of a unit. The VPort number, model, capacity, type, phy,
slot, and status are all displayed, as they are for drives in existing units.
The available drives can be sorted by VPort, model, capacity, type, phy, or
slot by clicking on the column headings. (For details about these attributes,
see “Drive Information page” on page 219.)
Remove Drive. The Remove Drive button removes a drive from the
controller so that you can safely unplug it. Select the box for any drive in the
Available Drives list you wish to remove.
Create Unit
Use the Create Unit button to create a unit for use on the current controller.
Begin by selecting the drives you want to use in the list of Available Drives,
and then click
Create Unit . You will be prompted to select the unit Type,
Name, Stripe size (if applicable), and unit policy settings.
A window like the one below shows the drives you selected, and lets you
specify configuration settings.
Warning: When a unit is deleted, the data will be permanently deleted: the drives
cannot be reassembled into the same unit. If you want to reassemble the drives on
another controller and access the existing data, use Remove Unit
instead of
Delete Unit .
Warning: Physically removing drives which are not in hot swap bays can result in
a system hang or may even damage the system and the drive.