Revised : 28/9/91@20:14EST Newbury Data NDR ESDI drives models 4175 and 4380 ************************************************* ModelCylindersHeadsUnformatted Capacity NDR 4175 1224 7 179.38MB NDR 4380 1224 15 384.40MB Recording code: RLL Transfer rate : 10MHz Track to track access time: 2.7ms Random average seek time: 19.8ms Full length seek time: 42.5ms Terminator - 150 ohm resistor just below the 34-pin connector Drive Unit number - can be set from 1 to 7, the 7 pins to do this are on the top right hand corner of the drive when the connectors are at the top. Unit number 1 is set when the top pair of pins are jumpered and so on down to unit number 7 when the bottom pair are jumpered. Write Enable Jumper - LK3 Middle left of drive - when removed drive is write protected. Sectoring Mode Options - set by two triples of pins below the terminator. When the top two pins of each pair are jumpered the drive is Hard Sectored (sector pulse). If the bottom two pins are jumpered the drive is Soft Sectored (address mark). Number of Sectors - chosen using a bank of 5 pairs on pins on the middle right of the drive (LK8,LK7,...,LK4) if the drive uses hard sectoring. LK6 LK7 LK8 Sectors Bytes/sector (formatted) off on on 9 2048 on off on 18 1024 off off on 19 1024 on on off 32 512 off on off 34 512 off off off 35 512 on off off 36 512 (** Factory setting) on on on 65 256 === File ends