Extended Bios Translation; Using Extended Bios Translation; With Scsi Disk Drives Only; With Ms-Dos 5.0 And Above - Adaptec AVA-2822 User Manual

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Extended BIOS Translation

As SCSI disk drives have recently grown beyond 1 GByte in format-
ted capacity, they have run up against the DOS cylinder limit. All
current 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 Extended BIOS Translation
feature uses 255 heads and 63 sectors, extending the disk drive
capacity limit under DOS to 8 GBytes. To enable this feature, refer to
Advanced Configuration Options on page 3-10.
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 back up your disk drive
prior to any change in the translation method used.

Using Extended BIOS Translation

With SCSI Disk Drives Only

The Extended BIOS Translation feature on the AVA-2820/2822/2825
works with SCSI disk drives only. For standard IDE or EIDE drives,
see Using Disk Manager Software with Large Standard IDE or EIDE
Drives on page 4-4.

With MS-DOS 5.0 and Above

The Extended BIOS Translation feature works with DOS 5.0 and
above. Adaptec does not provide drivers for other operating sys-
tems for the AVA-2820/2822/2825 host adapters; however, due to
our extensive relationships with other companies, many Adaptec
products are recognized by many operating systems.
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AVA-2820/2822/2825 User's Guide
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Stock Number: 510609-00, Rev. B
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Current Date: 1/30/95
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Large SCSI Disk Drive Support
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ECN Date: 1/31/95
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