Maximum Capacity- Hard Disk Capacity; Multi-Sector Transfers - Fujitsu D2912 Bios Manual

Main Menu – System functions
Maximum Capacity– Hard disk capacity
Harddiskcapacity Harddiskparameters
Shows the capacity of the hard disk as an LBA value. The LBA value is the capacity calculated by the
BIOS based on the maximum possible number of sectors reported by the hard disk. IDE and BIOS
restrict the arrangement of hard disks into cylinders, heads and sectors through maximum permissible
values. The hard disk permits more cylinders but fewer heads than the BIOS. A combination of IDE
and BIOS restrictions leads to a maximum addressable storage area of 528 MByte.
Not for optical storage media.
The following table lists the maximum permissible values and the resulting
maximum usable memory capacities.
Max. sectors per
head (at 512 Byte)
Max. heads per
cylinder
Max. cylinders
Capacity
LBA Translation converts the physical arrangement of a hard disk into cylinders, heads
and sectors so that the logical values generated lie within the above BIOS limitations. This
means that a hard disk capacity of over 528 MByte can be used. The operating system
and application programmes make use of these logical hard disk values. Hard disks of over
528 MByte are configured and operated using LBA mode. If the hard disk supports the LBA
mode, then the full memory capacity of the hard disk can be used.
The BIOS also supports 48-bit addressing for hard disks. This industry standard specifies hard disk
capacities up to 144 PByte (Petabyte) - approximately 120,000 times the 137 GByte limit.
Multi–sector Transfers
Shows the number of sectors per block that can be recognised automatically by the BIOS.
Disabled
2 sectors
4 sectors
8 sectors
16 sectors
14
BIOS
63
256
1024
8.4 GByte 137 GByte
IDE
Combination
BIOS/IDE
255
16
65535
528 MByte
BIOS 48-bit LBA
63 65535
16 65535
1024 65535
144 PByte
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