Date: May 23, 1985 To: Files From: AMS Subject: Fixed Disk Drives - IBM PC/XT and AT ________________________________________________________________________ Built-in Drive Types Supported by XT Fixed-disk BIOS ________________________________________________________________________ DRIVE TYPE 0 1 2 3 Cylinders 306 375 306 306 Heads 2 8 6 4 Write Precomp no no 256 no Capacity(MB) 5.3 26.1 15.9 10.6 ________________________________________________________________________ Note: Type 2 drives for XT --->Tandon TM503 Type 3 drives for XT --->Micro-Science HH612 +++++Any drive larger than 15.5mb requires DOS 3.0+++++ Built-in Drive Types Supported by AT Fixed-disk BIOS ________________________________________________________________________ DRIVE TYPE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Cylinders 306 615 615 940 940 615 462 733 900 820 855 855 306 733 Heads 4 4 6 8 6 4 8 5 15 3 5 7 8 7 Write Pre- Comp 128 300 300 512 512 no 256 no no no no no 128 no Landing Zone 305 615 615 940 940 615 511 733 901 820 855 855 319 733 Capacity 10.6 32.1 49.0 32.1 117.5 37.2 21.3 (MB) 21.4 65.4 21.4 31.9 21.4 52.0 44.6 _________________________________________________________________________ NOTE: Type 1 drives for AT --->Micro-Science HH612 Type 2 drives for AT --->CMI 6426/6426S, Micro-Science HH725A Type 3 drives for AT --->CMI 6640 Type 9 drives for AT --->Maxtor XT1140 Type 13 drives for AT --->Disctron D-526 ++++++Any drive larger than 33mb requires a new FDISK program++++++ (ATASI 3051 drives are available with SPEEDSTOR software permitting up to 4 DOS partitions). Source: P.50, PC TECH JOURNAL, December l984 Independent research - FAMILY LEDGERS, Ltd.