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Table 2.3 disk drive specifications – Compaq 9900 User Manual

Page 36

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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.