The Promise 450GB SAS Drive Module for Xserve from Apple is a hot-pluggable spare hard drive for the Xserve. It can be used to add storage to an Xserve that does not have a full complement of drives or to use as a spare drive in the event of a drive failure. System administrators should always have at least one spare drive on hand to minimize downtime in the event of a drive failure.
| Capacity | 450GB |
| Interface | SAS |
| Drive Speed | 15,000rpm |
| Sustained Data Transfer Rate | Host Dependent |
| Average Seek Time | Not Specified by Manufacturer |
| Buffer | 16MB |
| Mounting | Hot Pluggable Enclosure |
| Required Host | Xserve (Early 2009) |
| Environmental Requirements | Not Specified by Manufacturer |
| Dimensions (WxHxD) | Not Specified by Manufacturer |
| Weight | Not Specified by Manufacturer |