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EXTERNAL SCSI DEVICE DISAPPEARING

By p.fascia ·
HI, I have a client W2000 PRO Ita SP2 with an adaptec 2920a and two external device connected, an Iomega 1 Gb jazz (scsi number 4) and a Fujitsu Dynamo 640 SE, magneto optical drive, able to read and write optical floppy of 640 an below (scsi number3). First they work perfectly, but sometimes they vanished from the computer, and if somebody click on the icon of the drive it says or "semaphore period expired", or sometimes "device not connected". Sometimes a reboot is able to revive them, sometimes only to turn off the machine, and sometimes neither that.
Any ideas?
Thank You for the attention
Paolo Fascia

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Sounds like termination

by Kizbit In reply to EXTERNAL SCSI DEVICE DISA ...

Make sure your SCSI chain is properly terminated. In a SCSI chain the first and last device should be terminated. In the case of an all external (or all internal) chain the SCSI card is considered to be the first device and should be terminated. Whichever device is cabled last should also be terminated. all devices that are physically cabled between the first and last device should not be terminated. i.e. if your jaz drive is cabled to the back of your computer and your M.O. drive is cabled to the back of the jaz drive the card and M.O. drive should be termed, jaz should not. Also watch that you don't exceed max cable length, which is about 3.5 meters for fast SCSI2

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