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4.6.1 Extended Translation
Adaptec SCSI controllers have always supported the full range of disk drive capacities under all major operating systems. As disk drives
have recently grown beyond 1 GB in formatted capacity, they have run up against the DOS 1024-cylinder limit.
To continue its support for all SCSI disk drive capacities under DOS, Adaptec has included an extended translation scheme for the
AIC-7896 SCSI controllers. This feature supports disk drives of up to 8 GB capacity under DOS. The section Extended BIOS Translation
for DOS Drives > 1 GB explains how to change the setting of this option. Most operating systems leave this option disabled.
4.6.2 DOS 1 GByte Limit
All current versions of DOS are limited to 1024 cylinders per drive. The standard translation scheme for SCSI host controllers, using 64
heads and 32 sectors, gives a maximum capacity of 1 GB.
To eliminate the 1-GB limit, Adaptec's extended translation feature uses 255 heads and 63 sectors, extending the disk drive capacity
limit under DOS to 8 GB.
If you have already partitioned a large hard disk drive with
one translation method, conversion to another method
erases the data on the drive. Be sure to back up your disk
drive prior to any change in the translation method.
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