Compaq 9900 - Manual (Page 36)

22 Chapter 2 Subsystem Architecture and Components
Table 2.3 Disk Drive Specifications
Disk Drive Type
Parameter
73 GB 47 GB 18 GB 146 GB 180 GB*
Formatted capacity (GB) 72.91 47.19 18.46 143.7 172.55
Platter diameter 3 inches 3 inches 3 inches 3 inches 3 inches
Physical cylinders (user area) 15,154 12,027 12,027 n/a 24,247
Physical tracks per physical cylinder
(number of heads)
24 (DKR1C)
10 (DKR2D)
23 (DKR1B)
16 (DKR1C)
9 (DKR2B)
6 (DKR2C)
10 24
Physical disk platters (user area)
(numbers of disks)
12 (DKR1C)
5 (DKR2D)
12 (DKR1B)
8 (DKR1C)
5 (DKR2B)
3 (DKR2C)
5 12
Sector length (byte) 520(512) 520(512) 520(512) 520 (512) 520(512)
Seek time (ms) MIN. 0.5/0.7 0.5/0.7 0.5/0.7 0.5/0.7 0.8 / 1.1
(Read/Write)
MAX. 12.0/13.0 12.0/13.0 12.0/13.0 10.0/11.0 16.0 / 17.0
AVE. 5.7/6.5 5.7/6.5 5.2/6.0 4.9/5.4 7.4 / 8.2
Revolution speed (rpm) 10,025 10,025 10,025 10,025 7,200
Average latency time (ms) 2.99 2.99 2.99 2.99 4.17
Internal data transfer rate (MB/sec) 33.6 to 56.6 30.2 to 45.6 30.2 to 45.6 57.3 to 99.9 35.3 to 63.5
Max. interface data transfer rate
(MB/sec)
100 100 100 100 100
*Caution and notes for the 180-GB HDDs:
„
Caution: The 180-GB HDDs should not be intermixed with other HDD types in the same
array domain (behind the same ACP pair). If 180-GB HDDs are used, all HDDs in that
array domain should also be 180-GB HDDs.
„
Note: Subsystems which contain the 180-GB HDDs do not have the same availability or
serviceability as those subsystems which do not contain 180-GB HDDs. Some offline
maintenance may be required.
„
Note: The 180-GB HDDs are intended for archival use and do not have characteristics
that make them suitable as performance devices.