IBM IC35L036UWDY10 Hard Drive Specifications - Page 31

Data transfer speed, 5.6 Buffering operation read ahead/write cache

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4.5.5 Data transfer speed Description Disk-Buffer Transfer (Zone 0) Instantaneous Sustained Disk-Buffer Transfer (Zone 16) Instantaneous Sustained Buffer-Host 68/80pin Ultra 320 Typical (Mbyte/s) All models 73.7 146-GB Model 66.7 73-GB Model 66.6 36-GB Model 66.4 18-GB Model 66.2 All models 37.5 146-GB Model 33.9 73-GB Model 33.9 36-GB Model 33.8 18-GB Model 45.9 320 Figure 14. Data transfer speed (sector size 512 bytes case) ! Instantaneous disk-buffer transfer rate is derived by (Number of sectors on a track)*512*(revolution/sec) NOTE: The number of sectors per track varies because of the linear density recording. ! Sustained disk-buffer transfer rate is defined by considering head/cylinder change time. This gives a local average data transfer rate. It is derived by (Sustained Transfer Rate) = A/(B +C) A = (Number of data sectors per cylinder) * 512 B = Average track change time C = (# of Surface) * (One revolution time) ! Buffer-host transfer rate defines the maximum data transfer rate on SCSI Bus. It also depends on the speed of the host. 4.5.6 Buffering operation (read ahead/write cache) This hard disk drive has a buffer for read ahead and write caching. For details, refer to the SCSI interface specification. Ultrastar 146Z10 hard disk drive specifications 15

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4.5.5 Data transfer speed
320
68/80pin Ultra 320
Buffer-Host
146-GB Model
33.9
73-GB Model
33.9
36-GB Model
33.8
18-GB Model
45.9
Sustained
All models
37.5
Instantaneous
Disk-Buffer Transfer (Zone 16)
146-GB Model
66.7
73-GB Model
66.6
36-GB Model
66.4
18-GB Model
66.2
Sustained
All models
73.7
Instantaneous
Disk-Buffer Transfer (Zone 0)
Typical (
Mbyte/s)
Description
Figure 14.
Data transfer speed (sector size 512 bytes case)
!
Instantaneous disk-buffer transfer rate is derived by
(Number of sectors on a track)*512*(revolution/sec)
NOTE: The number of sectors per track varies because of the linear density recording.
!
Sustained disk-buffer transfer rate is defined by considering head/cylinder change time. This gives a
local average data transfer rate. It is derived by
(Sustained Transfer Rate) = A/(B +C)
A = (Number of data sectors per cylinder) * 512
B = Average track change time
C = (# of Surface) * (One revolution time)
!
Buffer-host transfer rate defines the maximum data transfer rate on SCSI Bus. It also depends on the
speed of the host.
4.5.6 Buffering operation (read ahead/write cache)
This hard disk drive has a buffer for read ahead and write caching.
For details, refer to the SCSI interface
specification.
Ultrastar 146Z10 hard disk drive specifications
15