David Bryan pointed me to page 6-5 of www.hp.com/products1/rte/tech_support/documentation/documentation4/ 92084-90025.pdf which has the following table: model mbytes xfrRat(kbytes) #surf #cyl #secs(256by) # blocks acc time(ms) 7907A 41 600 2/unit 627 64 80,256/unit 44 7908A 16 561 5 370 35 64,750 58 7911A 27 835 3 572 64 109,824 43 7912A 64 835 7 572 64 256,256 43 7914A 132 1000 7 1152 64 516,096 41 7933/35 404 1000 13 1321 92 1,579,916 35 7936 307 1000 7 1396 123 1,202,956 31 7937 571 1000 13 1396 123 2,232,204 31 7941/42 24 625 3 968 32 92,928 48 7945/46 55 625 7 968 32 216,832 48 7957A 81 853 5 1013 63 319,095 42 7957B 81 875 4 1269 63 319,788 28 7958A 130 853 8 1013 63 510,552 42 7958B 152 875 6 1572 63 594,216 28 C2200 335 1840 8 1449 113 1,309,840 27 C2203 670 1840 16 1449 113 2,619,792 27