Adaptec 1520A - AHA Storage Controller Fast SCSI 10 MBps Guide de l'utilisateur télécharger pdf (Page 57)

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AHA-1510A/20A Series User’s Guide

Stock Number: 510400-00, Rev. C Page: A-1

Print Spec Number: 491842-00

Current Date: 11/18/94 ECN Date: 11/29/94

A-1

Support for Large

Disk Drives

Extended Translation (Using MS-DOS 5.0)

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. As disk drives have recently grown beyond 1 GByte in for-

matted 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

AHA-1520A/1522A host adapters. This feature supports disk drives

as large as 8 GBytes under DOS.

When to Enable Extended Translation

Extended translation is disabled by default. Use extended transla-

tion for > 1 GByte hard disks under DOS. Use standard translation,

not extended translation, on drives formatted with two or more par-

titions for different operating systems. Partitions for NetWare can be

larger than 1 GByte when using standard translation. For instruc-

tions on enabling extended translation, see Chapter 2, Host Adapter

Configuration.

Caution: Be sure to back up your disk drive before you

change the translation method on a disk drive. All data

is erased when you change from one translation scheme

to another.

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Adaptec 1520A - AHA Storage Controller Fast SCSI 10 MBps Guide de l'utilisateur Page 57