IBM Ultrastar 36LZX, Specifications

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4.5.5 Data transfer speed
80 [Mbyte/sec]
160 [Mbyte/sec] 68/80pin FAST40 Wide
68/80pin Ultra 160
Buffer-Host
DDYS-T36950 22.1 [Mbyte/sec]
DDYS-T18350 22.0 [Mbyte/sec]
DDYS-T09170 21.7 [Mbyte/sec] Sustained
26.0 [Mbyte/sec] Instantaneous
Disk-Buffer Transfer (Zone 11)
DDYS-T36950 36.1 [Mbyte/sec]
DDYS-T18350 35.9 [Mbyte/sec]
DDYS-T09170 35.5 [Mbyte/sec] Sustained
43.0 [Mbyte/sec] Instantaneous
Disk-Buffer Transfer (Zone 0)
Typical Description
Figure 14. Data transfer speed (sector size 512 bytes case)
Ÿ
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.
Ÿ
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 +D )
A = (Number of data sectors per cylinder) * 512
B = ((# of Surface per cylinder) - 1) * (Head switch time)
C = (Cylinder change time)
D = (# of Surface) * (One revolution time)
Ÿ
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.
7 x 512 KB or
14 x 256 KB or
28 x 128 KB Number of buffer segments:
Ultrastar 36LZX hard disk drive specifications
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