Deskstar 7K80 Hard Disk Drive Specification
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4.0 Drive characteristics
4.1 Default logical drive parameters
Notes:
1.
Number of cylinders: For drives with capacities greater than 8.45 GB the Identify Device information word 01
limits the number of cylinders to 16, 383 per the ATA specification.
2.
Logical layout: Logical layout is an imaginary drive parameter (that is, the number of heads) which is used to
access the drive from the system interface. The logical layout to Physical layout (that is, the actual Head and Sec-
tors ) translation is done automatically in the drive. The default setting can be obtained by issuing an IDENTIFY
DEVICE command.
Table 1: Formatted capacities
HDS728040PLAT20 HDS728080PLAT20
Physical Layout
Label capacity (GB) 40 80
Bytes per sector 512 512
Sectors per track 567-1170 567-1170
Number of heads 1 2
Number of disks 1 1
Data sectors per cylinder 567-1170 1134-2340
Data cylinders per zone 1444-4501 1444-4501
Logical layout
1
Number of heads 16 16
Number of Sectors per track 63 63
Number of Cylinders
2
16,383 16,383
Number of sectors 80,418,240 160,836,480
Total logical data bytes 41,174,138,880 82,348,277,760
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