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                         Hard Drive Specifications

                                          Avg       Miscellaneous
    Manufacturer          MB    Cyl  Hds Access      Information

    Alloy ID-160           125               30
    Atasi AT3020                  635   3         Wedge servo
    Atasi AT3033                  635   5         Wedge servo
    Atasi AT3046                  635   7
    Atasi AT3051                  703   7
    Atasi AT3085                 1024   8
    Bull D530                     987   3
    Bull D550                     987   5
    Bull D570                     987   7
    Bull D585                     987   7
    Bull D530                    1166   3
    CDC Wren I 9415-21            697   3         STnn, MFM, Voice coil
    CDC Wren I 9415-36            697   5         STnn, MFM, Voice coil
    CDC Wren II 9415-25           615   4         STnn, MFM, Voice coil
    CDC Wren II 9415-30           989   3         STnn, MFM, Voice coil
    CDC Wren II 9415-38           733   5         STnn, MFM, Voice coil
    CDC Wren II 9415-48           925   5         STnn, MFM, Voice coil
    CDC Wren II 9415-51     42    989   5    28   STnn, MFM, Voice coil
    CDC Wren II 9415-67           925   7         STnn, MFM, Voice coil
    CDC Wren II 9415-86     69    925   9         STnn, MFM, Voice coil
    CDC Wren II 9416-182   144    969   9         STnn, MFM, Voice coil
    CDC Wren V                    380  15    16   ESDI/SCSI, FH
    CDC Wren V                    702  15    16   ESDI/SCSI, FH
    CDC Wren VI                   766  15   16.5  ESDI/SCSI, FH
    CDC Wren VII          1.2G         15   16.5  SCSI, FH
    CMI CM3426                    612   4
    CMI CM5205                    256   4
    CMI CM5410                    256   4
    CMI CM5616                    256   4
    CMI CM6426                    615   4
    CMI CM6426S                   640   4
    CMI CM6640                    640   4
    CMS F40-K               42   1024   5    22   STnn, MFM, Voice coil
    CMS F60-K               42   1024   7         STnn, MFM, Voice coil
    CMS F70-K               42   1024   8         STnn, MFM, Voice coil
    CMS F80-K               42   1024   9         STnn, MFM, Voice coil
    Columbia SCSI           42    834   3    19   SCSI, RLL, Band stepper
    Core AT40F              40    564   4    10   ESDI, MFM, Voice coil
    Core AT43               43    988   5    20   STnn, MFM, Voice coil
    Core HC150             150   1024+       18   ESDI
    Emerald DOS 150-3000   150   1024+            ESDI
    Emulex ATS-170         142   1022             SCSI & ESDI
    Emulex ATS-380         310   1222             SCSI & ESDI
    FlashCard 49            49    615   6    28   STnn, RLL, Voice coil
    Fuji 302-13             10    612   2
    Fuji 302-26             20    612   4
    Fujitsu M2230AS               320   2
    Fujitsu M2233AS         10    320   4
    Fujitsu M2234AS               320   6
    Fujitsu M2235AS         21    320   8    56
    Fujitsu M2241AS               754   4
    Fujitsu M2242AS         43    754   7    33   STnn, MFM, Voice coil
    Fujitsu M2243AS         72    754  11    33   STnn, MFM, Voice coil
    Fujitsu M2263          778u        14    16   ESDI/SCSI, FH
    Hitachi DK511-5        699          7
    Hitachi DK511-8        823         10
    Hitachi DK515C-78      780u         8    16   SCSI, FH
    Hitachi DK515-78       780u         8    16   ESDI, FH
    IMI 5006H                     306   2
    IMI 5012H                     306   4
    IMI 5018H                     306   6
    Imprimis (see CDC)
    Irwin 416                     819   2
    Irwin 510                     628   2         HD/tape
    Irwin 516                     819   2         HD/tape
    Irwin 561                     180   4
    Kalok KL320             26u   615   4    40   STnn, MFM, Band stepper
    Kalok KL330             38u   615   4    40   STnn, RLL, Band stepper
    Maxtor XT1065           52    918   7    28   STnn, Voice coil
    Maxtor XT1085           68   1024   8    28   STnn, Voice coil
    Maxtor XT1105           83    918  11    28   STnn, Voice coil
    Maxtor XT1140          112    918  15    28   STnn, Voice coil
    Maxtor XT1190          150   1224        28   STnn, Voice coil
    Maxtor XT2085                1224   7    28   STnn, Voice coil
    Maxtor XT2140                1224  11         STnn, Voice coil
    Maxtor XT2190          160   1224  15         STnn, Voice coil
    Maxtor XT4170E         179u  1224   7    14   ESDI, MFM, FH Voice coil
    Maxtor XT4230E         231u  1224   9    16   ESDI, MFM, FH Voice coil
    Maxtor XT4380E         384u  1224  15    16   ESDI, MFM, FH Voice coil
    Maxtor XT4380S         384u  1224        16   SCSI, MFM, FH Voice coil
    Maxtor XT8380E         410u             14.5  ESDI, FH
    Maxtor XT8380S         410u             14.5  SCSI, FH
    Maxtor XT8760E         768u             16.5  ESDI, FH
    Maxtor XT8760S         768u             16.5  SCSI, FH
    Micropolis 1302               830   3
    Micropolis 1303               830   5
    Micropolis 1304               830   6
    Micropolis 1323              1024   4
    Micropolis 1323A             1024   5
    Micropolis 1324              1024   6
    Micropolis 1324A             1024   7
    Micropolis 1325              1024   8
    Micropolis 1333A        44   1024   5    28   STnn, MFM, Voice coil
    Micropolis 1335         71   1024   8    30
    Micropolis 1355        142   1022
    Micropolis 1518       1.2Gu        15    14   ESDI, FH
    Micropolis 1558        382u        15    18   ESDI, FH
    Micropolis 1568        765u        15    16   ESDI, FH
    Micropolis 1578        382u        15    18   SCSI, FH
    Micropolis 1588        765u        15    16   SCSI, FH
    Micropolis 1598       1.2Gu        15    14   SCSI, FH
    Microscience HH312      10    306   4
    Microscience HH325      20    612   4
    Microscience HH612      10    306   4
    Microscience HH725      21    612   4         Band stepper
    Microscience HH1050     44   1024   5    28   STnn, MFM, Voice coil
    Miniscribe 1006               306   2
    Miniscribe 1012               306   4
    Miniscribe 2006               306   2
    Miniscribe 3012         10    612   4
    Miniscribe 3053         44   1024   6    25   STnn, MFM, Voice coil
    Miniscribe 3212         10    612   4
    Miniscribe 3412               306   4
    Miniscribe 3425         20    615   4
    Miniscribe 3438       31.2    615   4
    Miniscribe 3650         50u   809   6    61   STnn, MFM, linear drive
    Miniscribe 3650F        50u   809   6    46   STnn, MFM, linear drive
    Miniscribe 3675         75u   809   6    61   STnn, MFM, linear drive
    Miniscribe 4010               480   2
    Miniscribe 4020               480   4
    Miniscribe 6032         26   1024   3
    Miniscribe 6053         43   1024   5    28   STnn, MFM, FH Voice coil
    Miniscribe 6085         71   1024   8
    Miniscribe 6128        104   1024   8
    Miniscribe 8051A        51u   745   4    28   STnn, MFM, Voice coil
    Miniscribe 8212               615   2
    Miniscribe 8425         20    615   4         STnn, MFM, 3.
    Miniscribe 8438       31.2    615   4
    Miniscribe 9380E       382u  1224  15    16   ESDI, RLL, FH Voice coil
    Miniscribe 9380S       382u  1224  15    16   SCSI, RLL, FH Voice coil
    Miniscribe 9780E       781u        15    17   ESDI, FH Voice coil
    Mitsubisi MR535         42    981   6         STnn, MFM, 5. Voice coil
    NEC D5662              385u              18   ESDI, FH
    NEC D5682              765u        18    16   ESDI, FH
    NEC D5862              385u              18   SCSI, FH
    NEC D5882              765u        18    16   SCSI, FH
    NEC 5124                      310   4
    NEC 5126                      612   4
    NEC 5146                      615   8
    Newberry Penny 340            615   8
    Northgate Turbo         42    809   6    36   STnn, RLL, Voice coil
    Plus Hardcard 40        42    612   4    40   STnn, RLL, Voice coil
    Priam ID45ATD2          42   1166   5    20   STnn, MFM, Voice coil
    Priam ID130            130   1224             STnn
    Priam ID40                    987   5
    Priam ID60                    987   7
    Priam V130                    987   3         STnn
    Priam V185                   1166   7
    Priam 638              382u        15    18   ESDI, 5.
    Priam 676              765u        15    14   ESDI, 5.
    Priam 738              382u        15    18   SCSI, 5.
    Priam 776              765u        15    14   SCSI, 5.
    Quadram Q520                  512   4
    Quadram Q530                  512   6
    Quadram Q540                  512   8
    Rodime RO101                  192   2
    Rodime RO102                  192   4
    Rodime RO103                  192   6
    Rodime RO104                  192   8
    Rodime RO201                  320   2
    Rodime RO202                  320   4
    Rodime RO203                  320   6
    Rodime RO204                  320   8
    Rodime RO201E                 640   2
    Rodime RO202E                 640   4
    Rodime RO203E           33    640   6
    Rodime RO204E                 640   8
    Rodime RO252            10    306   4
    Rodime RO352            10    306   4
    Rodime RO3055           45    872   7         STnn, MFM, Voice coil
    RMS 503                       153   2
    RMS 506                       153   4
    RMS 512                       153   8
    Seagate ST125           21    615   4    28   STnn, MFM, Band stepper
    Seagate ST125N          22    407   4         SCSI, RLL, Band stepper
    Seagate ST138           32    615   6    28   STnn, MFM, 3. Band stepper
    Seagate ST138N          31    615   4    28   SCSI, RLL, Band stepper
    Seagate ST138R          33    615   4    28   STnn, RLL, Band stepper
    Seagate ST151           43    977   5         STnn, MFM, Voice Coil
    Seagate ST157A          49    560   6    28   IDE, 3.
    Seagate ST157N          49    615   6    28   SCSI, 3. RLL, Band stepper
    Seagate ST157R          49    615   6    28   STnn, 3. RLL, Voice Coil
    Seagate ST177N          61    921   5         SCSI, RLL, Voice Coil
    Seagate ST206                 306   2         STnn, MFM, Band stepper
    Seagate ST213           11    615   2         STnn, MFM, Band stepper
    Seagate ST225           21    615   4    65   STnn, MFM, 5. Band stepper
    Seagate ST225N          21    615   4    65   SCSI, MFM, 5. Band stepper
    Seagate ST225R          21    667   2         STnn, RLL, 5. Band stepper
    Seagate ST238R          31    615   4    65   STnn, RLL, Band Stepper
    Seagate ST250R          42    667   4         STnn, RLL, Band stepper
    Seagate ST251           42    820   6    40   STnn, MFM, 5. Band stepper
    Seagate ST251-1         43    820   6    28   STnn, MFM, 5. Band stepper
    Seagate ST251N0         43    820   4    40   SCSI, RLL, 5. Band stepper
    Seagate ST251N1         43    630   4         SCSI, RLL, 5. Band stepper
    Seagate ST251R          43    820   6    40   STnn, RLL, 5. Band stepper
    Seagate ST277           66    820   6         STnn, MFM, 5. Band stepper
    Seagate ST277N0         65    820   6    40   SCSI, RLL, 5. Band stepper
    Seagate ST277N1         65    628   6         SCSI, RLL, 5. Band stepper
    Seagate ST277R          65    820   6    40   STnn, RLL, 5. Band stepper
    Seagate ST280A          72               29   IDE, 5.
    Seagate ST296N          85    820   6    28   SCSI, RLL, 5. Band stepper
    Seagate ST406            5    306   2         STnn, MFM, Band stepper
    Seagate ST412           10    306   4         STnn, MFM, FH Band stepper
    Seagate ST419           15    306   6         STnn, MFM, Band stepper
    Seagate ST425           20    306   8         STnn, MFM, Band stepper
    Seagate ST506            5    153   4         STnn, MFM, FH Band stepper
    Seagate ST1096N         84    906   7         SCSI, RLL, Voice coil
    Seagate ST1102A         89               29   IDE, 3.
    Seagate ST1144         125               19   IDE, 3.
    Seagate ST1239         211               15   IDE, 3.
    Seagate ST4026          21    615   4         STnn, MFM, Voice coil
    Seagate ST4038          32    733   5    40   STnn, MFM, FH Voice coil
    Seagate ST4051          43    977   5    40   STnn, MFM, Voice coil
    Seagate ST4053          44   1024   5    28   STnn, MFM, Voice coil
    Seagate ST4077R         65   1024   5    28   STnn, MFM, Voice coil
    Seagate ST4096          80   1024   9    28   STnn, MFM, FH Voice coil
    Seagate ST4144R        122   1024   9    28   STnn, RLL, FH Voice coil
    Shugart SA 604                160   4
    Shugart SA 606                160   6
    Shugart SA 612                306   4
    Shugart SA 712                320   4
    SPC Scorecard 44        44    753   7         STnn, MFM, Voice coil
    Syquest SQ306RD               306   2
    Syquest SQ312RD               615   2
    Syquest SQ325F                612   4
    Syquest SQ338F                612   6
    Tandon TM252            10    306   4
    Tandon TM262            20    615   4
    Tandon TAN501                 306   2
    Tandon TAN502                 306   4
    Tandon TAN503                 306   6
    Tandon TM602S                 153   4
    Tandon TM603S                 153   6
    Tandon TM603SE                230   6
    Tandon TM702AT                615   4
    Tandon TM703                  695   5
    Tandon TM703AT                733   5
    Tandon TM755                  981   5
    Tandy SCSI              80    823   6    28   SCSI, RLL, Band stepper
    Toshiba MK53F                 830   5
    Toshiba MK54F           49    830   7    25   STnn, MFM, 3. Voice coil
    Toshiba MK56F           72    830  10    25
    Toshiba MK134FA               733   7    25   STnn
    Toshiba MK358FA        765u        15    16   ESDI, FH
    Toshiba MK358FB        765u        15    16   SCSI, FH
    Tulin 226                     640   4
    Tulin 240                     640   6
    Tulin 326               20    640   4
    Tulin 340               30    640   6
    WD93024A              21.6               28   STnn, MFM, 3. Band stepper
    WD93024X              21.6               39   STnn, MFM, 3. Band stepper
    WD93028A              21.6               69   STnn, MFM, 3. Band stepper
    WD93028X              21.6               70   STnn, MFM, 3. Band stepper
    WD93034X              32.4               39   STnn, MFM, 3. Band stepper
    WD93038X              32.4               70   STnn, MFM, 3. Band stepper
    WD93044A              43.2               28   STnn, MFM, 3. Band stepper
    WD93044X              43.2               39   STnn, MFM, 3. Band stepper
    WD93048A              43.2               69   STnn, MFM, 3. Band stepper
    WD93048X              43.2               70   STnn, MFM, 3. Band stepper
    WD95024A                20               28   STnn, MFM, 5. Band stepper
    WD95028AD               20               69   STnn, MFM, 5. Band stepper
    WD95028X                20               70   STnn, MFM, 5. Band stepper
    WD95038X                30               70   STnn, MFM, 5. Band stepper
    WD95044A                40               28   STnn, MFM, 5. Band stepper
    WD95048AD               40               69   STnn, MFM, 5. Band stepper
    WD95048X                40               70   STnn, MFM, 5. Band stepper
    WDAC140               42.5               19   STnn, MFM, 3. Voice coil
    WDAC280               85.1               19   STnn, MFM, 3. Voice coil
    WDSC320                320                    SCSI, 3.
    WDSC8320               320                    SCSI, 3.


        - STnn indicates Seagate ST412/ST506 compatible
        - 3. indicates 3.5 inch half height drive
        - 5. indicates 5.25 inch half height drive
        - FH indicates Full Height 5.25 inch drive
        - 'u' in filesize indicates unformatted spec
        - formatted capacity is related to BIOS and may vary with different
          BIOS and OEM versions
        - read/write heads should normally never touch hard disk media
        - standard AT hard disk controllers do not use DMA for disk I/O due
          to the slow speed of the 8 Bit DMA chips used;  Port I/O is used
          instead for an actual increase in performance
        - with some XT and ESDI systems it is necessary to use debug to
          execute the ROM disk format code;  The usual method is to set
          AH=Drive, AL=Interleave and jump to the code at C800:5 via the
          G =C800:5 command (some systems locate this code at C600:5, CA00:5
          and CC00:5)
        - DOS version and disk size determine cluster size;   DOS 2.x always
          has cluster size of 8K, while DOS 3.x+ has variable cluster sizes:

                    2 - 16  Mb partitions have a cluster size of 8K
                   16 - 128 Mb partitions have a cluster size of 2K
                  128 - 256 Mb partitions have a cluster size of 4K
                  256 - 512 Mb partitions have a cluster size of 8K