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Translation Mode
Modern hard-disks have more cylinders than maximum number of cylinders permitted by DOS,
so, theoretically, a DOS machine couldn’t use a modern big-sized hard disk. This problem is
solved using a special addressing mechanism. This “mechanism” is called
translation
. The most
common translation methods are
LBA (Logical Block Addressing)
and
ECHS (Enhanced
Cylinders - Heads - Sectors).
Option
Description
Note
LBA (*)
LBA translation
Default setting for both
ATAPI Units (Master1 &
Slave1)
(*) = Default setting
ECHS
Extended CHS translation
Cylinders
Number of
hard-disk cylinders
(normally written on the disk label). If the autodetection is used
(suggested method!), the cylinders value is ignored by the BIOS.
Option
Description
Note
0..65536
Number of cylinders
0 is the default setting for
both ATAPI Units (Master1
& Slave1)
Heads
Number of
hard-disk heads
(normally written on the disk label). If the autodetection is used
(suggested method!), the heads value is ignored by the BIOS.
Option
Description
Note
0..64
Number of heads
0 is the default setting for
both ATAPI Units (Master1
& Slave1)
Sect/Tr
Number of
sectors per track
(normally written on the disk label). If the autodetection is used, the
sectors value is ignored by the BIOS.
Option
Description
Note
0..255
Number of sectors per track
0 is the default setting for
both ATAPI Units (Master1
& Slave1)
Size (MB)
This is the
hard-disk size
, in Mbytes, calculated by the BIOS, using either the autodetect method
or the user hand-written values (for cylinders, heads and sectors).
•
Note:
the size cannot be changed directly by the user.
