Main Menu – System functio ns
Maximum Capacity – Hard disk capacity
HarddiskparametersHarddiskcapacity
Shows the capacity of the hard disk as an LBA value. The LBA value is the capacity calculated by the
BIOS based on the m a ximum possible number of sectors rep orted by the hard disk. IDE and BIOS
restrict the arrangeme nt of hard disks into cylinders, heads and sectors through maximum permissible
values. The hard disk permits more cylinders bu t fewer heads than the BIOS. A combination o f ID E
and BIOS restrictions leads to a maximum addressable storage area of 528 MByte.
Not for optical storage media.
The following table lists th e maximum permissible values and the r esu lting
maximum usable memory capacities.
BIOS
IDE
Combination
BIOS/IDE
BIOS 48-bit LBA
Max. sectors per
head (at 512 Byte)
63 255 63 65535
Max. heads per
cylinder
256 16 16 65535
Max. cylinders 1024 65535 1024 65535
Capacity 8.4 G B yte 137 GByte
528 MByte 144 PByte
LBA Translation converts the physical arran gement 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 c apa city 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, the n the full memory capacity of the hard disk can be used.
The BIOS also supports 48-bit addressing for hard disks. This industry standard speci fies hard disk
capacities up to 144 PByte (Petabyte) - approxim ately 120,000 times the 137 GByte limit.
Multi–sector Transfers
Shows the number of sectors per block that can be recognised automatically by the BIO S.
Disabled
2sectors
4sectors
8sectors
16 sectors
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