Drive Parameters                                WESTERN  DIGITAL CORPORATION
============================================================================

This file contains the parameters for all Western Digital hard drives, 
starting with older models to the latest Enhanced IDE Caviar family.


Abbreviations: Cap: Capacity, Cyl: Cylinders, Hd: Heads, WPC: Write
               precompensation, LZone: Landing zone, spt: Sectors per track
	       =============================================================


Model          Cap      Cyl    Hd       WPC    LZone   Access  spt   Total
-----          ---      ---    --       ---    -----   ------  ---   -----
Caviar

WDAC140        42.6     980     5       980     980    SUB-15  17     83314
WDAC160        62.5    1024     7      1024    1024    SUB-17  17    122265
WDAC280        85.3     980    10       980     980    SUB-15  17    166628
WDAC1170      170.6    1010     6      1010    1010    SUB-17  55    333300
WDAC2120      125       872     8       872     872    SUB-15  35    244530
WDAC2170      170.6    1010     6      1010    1010    SUB-14  55    333568
WDAC2200      212.6     989    12       989     989    SUB-15  35    415408
WDAC1210      212.6     989    12       989     989    SUB-13  35    414540
WDAC2250      256      1010     9      1010    1010    SUB-13  55    499950
WDAC1270      270       917    12       917     917    SUB-11  48    528192
WDAC2340      341.3    1010    12      1010    1010    SUB-13  55    666600
WDAC1365      365.4     708    16       708     708    SUB-12  63    713664
WDAC2420      425.3     989    15       989     989    SUB-12  56    830760
WDAC1425      426.8     827    16       827     827    SUB-12  63    833616
WDAC2540      540.8    1048    16      1048    1048    SUB-12  63   1056384
WDAC2635      639.9    1240    16      1240    1240    SUB-11  63   1249920
WDAC2700      730.3    1416    16      1416    1416    SUB-11  63   1427328
WDAC2850      853.2    1654    16      1654    1654    SUB-11  63   1667232
WDAC11000    1055.9    2046    16      2046    2046    SUB-12  63   2062368
WDAC21000    1083.3    2100    16      2100    2100    SUB-11  63   2116800
WDAC31000    1083.3    2100    16      2100    2100    SUB-11  63   2116800
WDAC11200    1282      2484    16      2484    2484    SUB-12  63   2503872
WDAC21200    1203.2    2484    16      2484    2484    SUB-12  63   2503872
WDAC31200    1203.2    2484    16      2484    2484    SUB-12  63   2503872
WDAC21600    1624.6    3148    16      3148    3148    SUB-12  63   3173184
WDAC31600    1624.6    3148    16      3148    3148    SUB-12  63   3173184
WDAC21700    1707.2    3308    16      3308    3308    SUB-12  63   3334464
WDAC22000    2000      3876    16      3876    3876    SUB-12  63   3907008
WDAC22100    2111.8    4092    16      4092    4092    SUB-12  63   4124736
WDAC32100    2134.5    4092    16      4092    4092    SUB-12  63   4169088
WDAC22500    2560      4960    16      4960    4960    SUB-12  63   4999680
WDAC32500    2559.8    4960    16      4960    4960    SUB-12  63   4999680
WDAC33100    3166.7    6136    16      6136    6136    SUB-12  63   6185088
WDAC33200    3249      6296    16      6296    6296    SUB 12  63   6346368
WDAC34000    4001      7752    16      7752    7752    SUB-12  63   7814016


Model           Cap      Cyl    Hd      WPC     LZone   Access  spt  Total
-----           ---      ---    --      ---     -----   ------  ---  -----
Caviar Lite

WDAL180          85      980    10      980     980     SUB-16  17   166600
WDAL1100        100      958     6      958     958     SUB-17  34   195432
WDAL2120        120     1001    15     1001    1001     SUB-16  17   255255
WDAL2170        170      980    10      980     980     SUB-16  34   333200
WDAL2200        200.1    958    12      958     958     SUB-17  34   390864
WDAL2540 	540.8	1048	16     1048    1048     SUB-13  63  1056384 	


Model           Cap      Cyl    Hd      WPC     LZone   Access  spt  Total
-----           ---      ---    --      ---     -----   ------  ---  -----
Tidbit

WDAB130         31.9     733     5      733     733     SUB-16  17    62475
WDAH260         63.2    1024     7     1024    1024     SUB-16  17   123546
WDAB140         42.7     980     5      980     980     SUB-16  17    83564
WDAH280         85.5     980    10      980     980     SUB-16  17   167130


Model        Cap     Cyl     WPC     Hd     LZone   Access   spt     Total
-----        ---     ---     ---     --     -----   ------   ---     -----
AT

WD-93028-A   21.4    615     615     4       616     69      17      41820
WD-93048-A   42.5    977     977     5       978     69      17      83045
WD-95028-A   21.4    615     615     4       616     69      17      41820
WD-95048-A   42.5    977     977     5       978     69      17      83045
WD-93028-AD  21.4    615     615     4       616     69      17      41820
WD-93048-AD  42.5    977     977     5       978     69      17      83045
WD-95028-AD  21.4    615     615     4       616     69      17      41820
WD-95048-AD  42.5    977     977     5       978     69      17      83045
WD-93024-A   21.4    615     615     4       616     28      17      41820
WD-93044-A   42.5    977     977     5       978     28      17      83045
WD-95024-A   21.4    615     615     4       616     28      17      41820
WD-95044-A   42.5    977     977     5       978     28      17      83045
WDAP4200     212.2   987     988     12      988   SUB-15    35     414540


Model      Cap     Cyl     WPC     Hd     LZone    Access  spt     Total
-----      ---     ---     ---     ---    -----    ------  ---     -----
SCSI

WDSP4200   209.7   1280    N/A      8      N/A     SUB-15   41      N/A
WDSC8320   320      949    N/A     N/A     N/A      12.5    48      N/A
WDSC8400   400     1199    N/A     N/A     N/A      11.5    48      N/A


Model        Cap     Cyl     WPC     Hd     LZone   Access   spt     Total
-----        ---     ---     ---     --     -----   ------   ---     -----
MFM 

WD262	     20	     615     615      4      615     80      17       N/A
WD362        20      615     615      4      615     80      17       N/A


Model        Cap     Cyl     WPC     Hd     LZone   Access   spt     Total
-----        ---     ---     ---     --     -----   ------   ---     -----
RLL 

TM262R        20     782     783      4      783      85      26       N/A
TM364         40     782     783      4      783      85      26       N/A
WD344R        40     782     783      4      783      40      26       N/A
WD382R        20     782     783      2      783      85      26       N/A
WD383R        30     616     616      4      616      85      26       N/A
WD384R        40     782     783      4      783      85      26       N/A
WD544R        40     782     783      4	     783      40      26       N/A
WD582R        20     782     783      2      783      85      26       N/A
WD583R        30     615     616      4      616      85      26       N/A
WD584R        40     782     783      4      783      85      26       N/A


Model        Cap     Cyl     WPC     Hd     LZone   Access   spt     Total
-----        ---     ---     ---     --     -----   ------   ---     -----
XT

WD-93028-X   21.4    615     615     4       616     70      17      41820
WD-93038-X   32.1    615     615     6       616     70      17      62730
WD-93048-X   42.5    977     977     5       978     70      17      83045
WD-93024-X   21.4    615     615     4       616     39      17      41820
WD-93034-X   32.1    615     615     6       616     39      17      62790
WD-93044-X   42.5    977     977     5       978     39      17      83045
WD-95028-X   21.4    615     615     4       616     70      17      41820
WD-95038-X   32.1    615     615     6       616     70      17      62730
WD-95048-X   42.5    977     977     5       978     70      17      83045
WD-95024-X   21.4    615     615     4       616     39      17      41820
WD-95034-X   32.1    615     615     6       616     39      17      62730
WD-95044-X   42.5    977     977     5       978     39      17      83045

---
Last updated March-25-97
