Table of Contents
Advertisement
4.5.2 Drive ready time
Table 9: Drive ready time
Model
450 GB Model
300 GB Model
4.5.3 Spindle stop time
Table 10: Spindle stop time
Model
450 GB Model
300 GB Model
The period from power off to the complete stop of the rotating spindle is categorized as 'operating'. The Operating shock crite-
ria apply during this period. Refer to section 12.3, "Operating shock" on page 41.
4.5.4 Data transfer speed
Table 11: Data transfer speed (sector size 512 Byte case)
Description
Disk-buffer transfer
Instantaneous
Measured typical values for sustained disk-
buffer tranfer rate
Instantaneous
Measured typical values for sustained disk-
buffer tranfer rate
Notes:
•
Instantaneous disk-buffer transfer rate is derived by: (Number of sectors on a track) x 512 x (revolutions/sec)
•
For this table, '1 MB / Sec' should be interpreted as 1,000,000 bytes per Second.
•
The number of sectors per track will vary by zone because of the linear density recording.
•
Sustained disk-buffer transfer rate is the average rate measured while transferring multiple cylinders of data. It dif-
fers from the instantaneous transfer rate because of the time required to change tracks (Cylinder skew and Head
skew). In addition, time is added for the occasional missed transfer.
4.5.5 Buffering operation (read ahead/write cache)
This hard disk drive has a buffer for read ahead (see Segmented Caching, page 331).
Typical (sec)
21.0
21.0
Typical (sec)
Maximum (sec)
11.0
11.0
Zone
0
0
0
0
22
17
22
17
Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
Maximum (sec)
29.9
29.9
20
20
Typical (MB / Sec)
Model
Read
Write
450 GB
179.7
179.7
300 GB
152.1
152.1
450 GB
160.0
155.8
300 GB
135.0
131.5
450 GB
112.3
112.3
300 GB
110.6
110.6
450 GB
99.9
97.3
300 GB
98.2
95.6
13
Advertisement
Table of Contents
