IBM Mainframe Disk Capacity Table

IBM Mainframe Disk Capacity Table

Count Key Data (CKD) Devices

Fixed Block Architecure (FBA) Devices

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Count Key Data (CKD) Devices

Fixed Block Architecure (FBA) Devices

The following tables contain the IBM mainframe disk capacities for all disks since dinosaurs roamed the Earth. If you know of any disks that should be added to this table, please send an e-mail to support@sdisw.com.

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Disk Type	Data cylinders	Alternate cylinders	Tracks per cylinder	Bytes per track	Bytes per cylinder	Bytes per module
2305-1	48	6	8	14,136	113,088	5,428,224
2305-2	96	12	8	14,660	117,280	11,258,880
2311	200	3	10	3,625	36,250	7,250,000
2314	200	3	20	7,294	145,880	29,176,000
3330-1	404	7	19	13,030	247,570	100,018,280
3330-11	808	7	19	13,030	247,570	200,036,560
3340-35	348	1	12	8,368	100,416	34,944,768
3340-70	696	2	12	8,368	100,416	68,889,536
3344 (1)	2784	8	12	8368	100,416	275,558,144
3350	555	5	30	19,069	572,070	317,498,850
3375	959	1	12	35,616	427,392	409,868,928
3380 A/B/D/J	885	1	15	47,476	712,140	630,243,900
3380 E	1770	2	15	47,476	712,140	1,260,487,800
3380 K	2655	3	15	47,476	712,140	1,890,731,700
EMC338OK+	3339	3	15	47,476	712,140	2,377,835,460
EMC338OK+ +	3993	3	15	47,476	712,140	2,843,575,020
3390-1	1113	1	15	56,664	849,960	946,005,480
3390-2	2226	1	15	56,664	849,960	1,892,010,960
3390-3	3339	1	15	56,664	849,960	2,838,016,440
3390-9	10017	3	15	56,664	849,960	8,514,049,320
3390-27 (2)	32760	3	15	56,664	849,960	27,844,689,600
3390-54	65520	3	15	56,664	849,960	55,689,279,200
9345-1	1440	0	15	46,456	696,840	1,003,449,600
9345-2	2156	0	15	46,456	696,840	1,502,387,040

Disk Type	Bytes per block	Blocks per track	Blocks per cylinder	Blocks per actuator	Bytes per actuator
3310	512	32	352	125,664	64,339,968
3370-Al/BI	512	62	744	558,000	285,696,000
3370-A2/B2	512	62	744	712,752	364,929,024
9332-200	512	73	292	360,036	184,338,432
9332-400	512	73	292	360,036	184,338,432
9332-600	512	73	292	554,800	284,057,600
9335	512	71	426	804,714	412,013,568
9336-10	512	63	315	920,115	471,098,880
9336-20/25	512	111	777	1,672,881	856,515,072

Notes:

The 3344 always operates in 3340 compatibility mode, emulating four 3340's per drive. Capacity is therefore equal to that of four 3348 Model 70s.
The name 3390-27 is a descriptive term that indicates the relative size of a 32,760 cylinder volume (27 GB) rather than a specific device type. From the operating system perspective, a volume larger than 3339 cylinders is reported as a 3390-9 device type.

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