## About Disk Drives

The following table describes the disk drives of the system.

Feature | Description
--- | ---
Drive population | Seven to 14 drives per storage tray
Mixed drive size support | Mixing drive sizes is allowed but not recommended. If drives of different sizes are mixed in a storage tray, all the drives are treated as the smallest drive. For example, in a tray with a drive of 36 Gbytes and a drive of 146 Gbytes, only 36 Gbytes of the second drive is used. When the system is operating with mixed drive size support, the hot spare must be the size of the largest drive in the tray.
Drive capacities | 36GB/15K, 73GB/10K, 146 GB/10K
Online addition/removal of disks | Yes
Array hot spare | Dedicated; that is, located in the array configuration and available as a spare to any virtual disk in the array configuration.
Dedicated hot spare | Dedicated to the virtual disk; that is, located in the same array as the virtual disk.
Minimum number of disks | 14
Maximum number of disks | 448

For information on the current disk configuration, see the Tray Subreport - Disks Summary page, as described in Displaying Disk Information.

### Related Topics

- Displaying Disk Information