IBM IC35L020 - Deskstar 20 GB Hard Drive - 4.0 Fixed disk characteristics; 4.1 Formatted capacity

4.0 Fixed disk characteristics
4.1 Formatted capacity
61,492,838,40041,174,138,88030,738,677,76020,576,747,52010,278,051,840Total logical data bytes
120,103,20080,418,24060,036,48040,188,96020,074,320Number of sectors
16,38316,38316,38316,38316,383Number of cylinders (2)
6363636363Number of sectors/track
1616161616Number of heads
Logical layout
(1)
1100–27001100–27001100–27001100–27001100–2700Data cylinders per zone
2238–46801492–31201119–2340746–1560373–780Data sectors per
cylinder
32211Number of data disks
64321Number of data heads
373–780373–780373–780373–780373–780Sectors per track
512512512512512Bytes per sector
61.54130.720.510Label capacity (GB)
Physical Layout
60 GB40 GB30 GB20 GB10 GBDrive capacity
Figure 1. Formatted Capacity
Note (1): Logical Layout
Logical layout is an imaginary HDD parameter (that is the number of Heads) which is used to access the
HDD from the system interface. The Logical layout to Physical layout (that is the actual number of Head
and Sectors) translation is done automatically in the HDD. The default setting can be obtained by issuing
an IDENTIFY DEVICE command.
Note
(2): 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.
4.2 Data sheet
18Data Bands
14.8 (Gb/in
2
)Areal Density
34 (kTPI)Track Density
Up to 44 (kBPI)Recording Density
Up to 44Number of Buffer segments (write)
Up to 12Number of Buffer segments (read)
2,048 (KB)Data buffer size
1
100 (MB/s)
Data transfer rates (host to/from buffer)
—Interface transfer rate
495 (Mb/s)Data transfer rates (buffer to/from media)
7,200 (RPM)Rotational Speed
Figure 2. Mechanical positioning performance
1
The Upper 132 KB is used for firmware
.
Deskstar 60 GXP Hard disk drive specification
9