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IBM 5170  -  Hard Drive Support In BIOS


IMPORTANT:   The following assumes that your IBM 5170 motherboard is fitted with IBM 5170 BIOS ROM's (i.e. not swapped out for non-IBM ones).
Although authors of other BIOS' often mimicked IBM (to maintain IBM compatibility), some authors did not.
Example: A Seagate ST-4038 drive is a type 20 on an IBM 5170, but a different type number on certain ALR computers.


SPT = Sectors Per Track

WPC = Write Pecompensation Cylinder (WPC)


  Cylinder
Count
Head
Count
SPT WPC 01/10/84
BIOS
06/10/85
BIOS
11/15/85
BIOS
    Comment
Type 1 306 4 17 128 Yes Yes Yes  
Type 2 615 4 17 300 Yes Yes Yes Examples: CMI model 6426, Seagate ST-4026
Type 3 615 6 17 300 Yes Yes Yes  
Type 4 940 8 17 512 Yes Yes Yes  
Type 5 940 6 17 512 Yes Yes Yes  
Type 6 615 4 17 none Yes Yes Yes Some Internet sources may show no WPC as "N/A" or "-1" or "65535"
Type 7 462 8 17 256 Yes Yes Yes  
Type 8 733 5 17 none Yes Yes Yes Some Internet sources may show no WPC as "N/A" or "-1" or "65535"
Type 9 900 15 17 none Yes Yes Yes Some Internet sources may show no WPC as "N/A" or "-1" or "65535"
Type 10 820 3 17 none Yes Yes Yes Some Internet sources may show no WPC as "N/A" or "-1" or "65535"
Type 11 855 5 17 none Yes Yes Yes Some Internet sources may show no WPC as "N/A" or "-1" or "65535"
Type 12 855 7 17 none Yes Yes Yes Some Internet sources may show no WPC as "N/A" or "-1" or "65535"
Type 13 306 8 17 128 Yes Yes Yes  
Type 14 733 7 17 none Yes Yes Yes Some Internet sources may show no WPC as "N/A" or "-1" or "65535"
Type 15 - - - - - - - Do not use.  More information.
Type 16 612 4 17 0 (all) No Yes Yes  
Type 17 977 5 17 300 No Yes Yes  
Type 18 977 7 17 none No Yes Yes  
Type 19 1024 7 17 512 No Yes Yes  
Type 20 733 5 17 300 No Yes Yes  Examples: Seagate ST-4038, IBM 0665-38
Type 21 733 7 17 300 No Yes Yes  
Type 22 733 5 17 300 No Yes Yes  
Type 23 306 4 17 0 (all) No No Yes