SCSI: Basics

Support knowledgebase (rb_scsi)
Applies to

SuSE Linux: All versions

Types of SCSI Cards

Type Frequency Connector Transfer rate Terminator Cable length
SCSI 15 MHz 50 pin /
8 bit bus width
or Centronics
max. 5 MB/sec passive terminator
(SE - single ended)
<= 3 m
max. length
Examples of this card type
  • Adaptec 1542B
  • Seagate ST01/02
Fast SCSI up to 10 MHz 50 pin /
8 bit bus width
max. 10 MB/sec active terminator recommended
passive terminator partly poss.
(SE)
<= 3 m
max. length
Example of this card type
  • Adaptec 15
Wide SCSI up to 10 MHz 68 pin /
16 bit bus width
max. 20 MB/sec active terminator recommended
passive partly poss.
(SE)
<=3 m
max. length
Ultra SCSI/SCSI 2 up to 20 MHz 50 pin /
8 bit bus width
max. 20 MB/sec active terminator required
(SE)
?
Ultra Wide up to 20 MHz 68 pin /
16 bit bus width
max. 40 MB/sec active terminator
(SE)
<= 1.5 m
max. length
>= 20 cm between
devices
Ultra 2 Wide up to 40 MHz 68 pin /
16 bit bus width
max. 80 MB/sec active terminator
(LVD terminator -
Low Voltage Differential)
external terminator
absolutely required
<=12 m
max. length
>= 20 cm between
devices

Keywords: SCSI, UW, U2W, WIDE, ULTRA WIDE, MHZ, FAST, BUS

Categories: SCSI

SDB-rb_scsi, Copyright SuSE Linux AG, Nürnberg, Germany - Version: 05. Jul 2002
SuSE Linux AG - Last generated: 05. Jul 2002 by glazzar (sdb_gen 1.40.0)