| Backplane/Centerplane | 
| Option # | Manufacturing Part #
 | Description | Previous Part #
 | 
| X6751A
 [S] | 595-6213 | Storage Expansion Kit, includes 1 of the following backplanes and 6 of the following disks: | n/a | 
|  | 6 Slot FC Base/Expansion Backplane
 | 501-5993
 [F] | 
|  | 36.4GB - 10000 RPM FC-AL, Disk Assembly with 1 bracket, 1 of the following plates, and 1 of the following disks: 
 | n/a | 
|  |  | n/a | 
|  |  | n/a | 
|  | Seagate ST336704FC [ST336704FSUN36G](36.4GB - 10000 RPM - FC-AL Disk)
 | n/a | 
|  | Seagate ST336605FC [ST336605FSUN36G](36.4GB - 10000 RPM - FC-AL Disk)
 | n/a | 
|  | Seagate ST336607FC [ST336607FSUN36G](36.4GB - 10000 RPM - FC-AL Disk)
 | n/a | 
|  |  | n/a | 
| X6756A
 [S] | 595-6347 | Storage Expansion Kit, includes 1 of the following backplanes and 6 of the following disks: | n/a | 
|  | 6 Slot FC Base/Expansion Backplane
 | 501-5993
 [F] | 
|  | 73.4GB - 10000 RPM FC-AL, Disk Assembly with 1 bracket, 1 of the following plates, and 1 of the following disks:
 | n/a | 
|  |  | n/a | 
|  |  | n/a | 
|  | Seagate ST373405FC [ST373405FSUN72G](73.4GB - 10000 RPM - FC-AL Disk)
 | n/a | 
|  | Fujitsu MAN3735FC [MAN3735F SUN72G](73.4GB - 10000 RPM - FC-AL Disk)
 | n/a | 
|  | Seagate ST373307FC [ST373307FSUN72G](73.4GB - 10000 RPM - FC-AL Disk)
 | n/a | 
|  | Fujitsu MAP3735FC [MAP3735F SUN72G](73.4GB - 10000 RPM - FC-AL Disk)
 | n/a | 
|  | Hitachi DK32EJ-72FC [DK32EJ72FSUN72G](73.4GB - 10000 RPM - FC-AL Disk)
 | n/a | 
|  | Seagate ST373207FC [ST373207FSUN72G](73.4GB - 10000 RPM - FC-AL Disk)
 | n/a | 
|  | Fujitsu MAT3073FC [MAT3073F SUN72G](73.4GB - 10000 RPM - FC-AL Disk)
 | n/a | 
|  | Hitachi HUS1073FA [HUS1073FASUN72G](73.4GB - 10000 RPM - FC-AL Disk)
 | n/a | 
|  |  | n/a | 
| n/a | 230-1697 | 3 nylon washers to insulate screws from FC Disk Backplane, included with X6751A and X6756A, required | n/a | 
| n/a | 501-5993
 [F] | 6 Slot FC Base/Expansion Backplane | n/a | 
| n/a | 501-6665
 [F] | 6 Slot FC Base/Expansion Backplane | 501-5993
 [F] |