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, 3½
   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, 5¼ 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, 5¼
   Priam 676	     	   765u	       15    14   ESDI, 5¼
   Priam 738	     	   382u	       15    18   SCSI, 5¼
   Priam 776	     	   765u	       15    14   SCSI, 5¼
   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, 3½ 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, 3½
   Seagate ST157N	    49    615   6    28   SCSI, 3½ RLL, Band stepper
   Seagate ST157R	    49    615   6    28   STnn, 3½ 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, 5¼ Band stepper
   Seagate ST225N	    21    615   4    65   SCSI, MFM, 5¼ Band stepper
   Seagate ST225R	    21    667   2	  STnn, RLL, 5¼ 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, 5¼ Band stepper
   Seagate ST251-1         43    820   6    28   STnn, MFM, 5¼ Band stepper
   Seagate ST251N0         43    820   4    40   SCSI, RLL, 5¼ Band stepper
   Seagate ST251N1         43    630   4	  SCSI, RLL, 5¼ Band stepper
   Seagate ST251R	    43    820   6    40   STnn, RLL, 5¼ Band stepper
   Seagate ST277	    66    820   6	  STnn, MFM, 5¼ Band stepper
   Seagate ST277N0         65    820   6    40   SCSI, RLL, 5¼ Band stepper
   Seagate ST277N1         65    628   6	  SCSI, RLL, 5¼ Band stepper
   Seagate ST277R	    65    820   6    40   STnn, RLL, 5¼ Band stepper
   Seagate ST280A	    72	             29   IDE, 5¼
   Seagate ST296N	    85    820   6    28   SCSI, RLL, 5¼ 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, 3½
   Seagate ST1144	   125	             19   IDE, 3½
   Seagate ST1239	   211	             15   IDE, 3½
   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, 3½ 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, 3½ Band stepper
   WD93024X	     	  21.6	             39   STnn, MFM, 3½ Band stepper
   WD93028A	     	  21.6	             69   STnn, MFM, 3½ Band stepper
   WD93028X	     	  21.6	             70   STnn, MFM, 3½ Band stepper
   WD93034X	     	  32.4	             39   STnn, MFM, 3½ Band stepper
   WD93038X	       	  32.4	             70   STnn, MFM, 3½ Band stepper
   WD93044A	     	  43.2	             28   STnn, MFM, 3½ Band stepper
   WD93044X	     	  43.2	             39   STnn, MFM, 3½ Band stepper
   WD93048A	     	  43.2	             69   STnn, MFM, 3½ Band stepper
   WD93048X	     	  43.2	             70   STnn, MFM, 3½ Band stepper
   WD95024A	     	    20 	             28   STnn, MFM, 5¼ Band stepper	  
   WD95028AD	     	    20 	             69   STnn, MFM, 5¼ Band stepper	  
   WD95028X	     	    20 	             70   STnn, MFM, 5¼ Band stepper	  
   WD95038X	     	    30 	             70   STnn, MFM, 5¼ Band stepper	  
   WD95044A	     	    40 	             28   STnn, MFM, 5¼ Band stepper	  
   WD95048AD	     	    40 	             69   STnn, MFM, 5¼ Band stepper	  
   WD95048X	     	    40 	             70   STnn, MFM, 5¼ Band stepper
   WDAC140 	     	  42.5	             19   STnn, MFM, 3½ Voice coil
   WDAC280 	     	  85.1	             19   STnn, MFM, 3½ Voice coil
   WDSC320 	     	   320	       	  	  SCSI, 3½
   WDSC8320	     	   320	       	  	  SCSI, 3½


	- STnn indicates Seagate ST412/ST506 compatible
	- 3½ indicates 3.5 inch half height drive
	- 5¼ 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