Adaptec AHA-2740-T User Manual download pdf (Page 102)

Extended Translation (Using DOS 5.0)

Adaptec host adapters have always supported the full range of

disk drive sizes under all major operating systems. As disk drives

have recently grown beyond 1 GByte 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 introduced an extended translation scheme for

the AHA-2740 Series of host adapters. This new feature bypasses

the DOS disk capacity limit and supports disk drives up to 8

GBytes in size under DOS, providing room for years of disk drive

evolution. To enable this feature, refer to Configure BIOS and

SCSI Device in Chapter 3.

The DOS 1 Gigabyte Limit

All versions of DOS are limited to 1024 cylinders per drive. The

standard translation scheme for SCSI host adapters, using 64

heads and 32 sectors, provides a maximum accessible capacity of

1 GByte.

To eliminate the 1 GByte limit, Adaptec’s new extended transla-

tion feature uses 255 heads and 63 sectors, extending the disk

drive capacity limit under DOS to 8 GBytes.

Caution

If you have already partitioned a large disk drive with one

translation method, conversion to another method will erase

your data. Be sure to backup your disk drive prior to any

change in the translation method used.

Adaptec AHA-2740 Series User’s Manual

Stock Number: 510381-00 / Rev. C (Page D-3)

Print Spec Number: 491709-00 Rev C

Current Date: 9/1/93 ECN Date: 9/14/93

D-3

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Adaptec AHA-2740-T User Manual Page 102