HP Vectra VE5 4 Technical Reference Manual page 27

Disk Capacity Versus
Modes of Addressing
Mode
Cycle time (ns)
Transfer rate (MB/s)
The three DMA modes (for single or double word) allow the following
transfer rates:
Mode
Cycle time (ns)
Transfer rate (MB/s)
The three Ultra ATA/33 modes (also know as Ultra DMA modes) allow the
following peak transfer rates:
Mode
Cycle time (ns)
Transfer rate (MB/s)
The amount of addressable space on a hard disk is limited by three factors:
the physical size of the hard disk, the addressing limit of the IDE hardware,
and the addressing limit of the BIOS. By performing a translation, the
Extended-CHS addressing scheme allows larger disk capacities to be
addressed than under CHS.
Cylinders per
Device
CHS 64
ECHS 64
LBA -
0 1
600 383
3.33 5.22
0 1
480 150
4.2 13.3
0 1
144 75
13.9 26.7
Heads per
Sectors per Track
Cylinder
16 1024
256 1024
- 256 M (=2
2 System Board
Devices on the PCI Bus
2 3
240 180
8.33 11.1
2
120
16.7
2
60
33.3
Bytes per
Sector
512
512
28
) 512
4
120
16.7
Bytes per
Device
528 M
8.4 G
137 G
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