Re: Powered-down IBM drive hangs bus

Article View: comp.sys.mac.hardware.storage

Article #65

Back to comp.sys.mac.hardware.storage Previous Next

#65

From: Norbert E. Kremer
Date: Thu, 23 Nov 1995 22:43

22 lines
1470 bytes

In article <48vi2f$k3b@hppadbk.waterloo.hp.com>, rypma@waterloo.hp.com (Ted Rypma) says:
>
>[Tried a question about jumpers earlier, no answers, so try again :-]
>
>I recently put my original 163 Mb PMac 6100 internal drive into an
>external box. It works fine there UNLESS I POWER IT DOWN. 


Ted,   I have often been able to get by with leaving power off on 
temporarily unused devices, such as a Seagate h.d. and a cd-rom
drive.    But I was never sure that it would work until I tried it. 

Is it written in stone somewhere that an unpowered SCSI device
must be invisible to the bus?  Maybe certain drives are designed with
line drivers/line receivers that must be powered up to present a 
reasonable load to the bus, i.e. the design assumes that if the drive
is connected, it will be powered up.   On any server or critical
equipment, I leave all attached external devices powered at all times, 
on my pc's I sometimes leave stuff off. 

Any other opinions?      
Norbert Kremer     norbert@mail.htp.com

Technical Details

Message-ID: <492tej$bfu@news.htp.com>

Path: arc1-ca.pugleaf.net!news.htp.com!usenet

References: <48vi2f$k3b@hppadbk.waterloo.hp.com>

Show Full Headers

Complete Article Headers

Path: arc1-ca.pugleaf.net!news.htp.com!usenet
From: norbert_kremer@mail.htp.com (Norbert E. Kremer)
Newsgroups: comp.sys.mac.hardware.storage,comp.sys.mac.system,comp.periphs.scsi
Subject: Re: Powered-down IBM drive hangs bus
Date: 23 Nov 1995 22:43:31 GMT
Organization: HTP Services 516-757-0210
Message-ID: <492tej$bfu@news.htp.com>
References: <48vi2f$k3b@hppadbk.waterloo.hp.com>
NNTP-Posting-Host: norbert.htp.com
X-Newsreader: WinVN 0.92.6+

Reply to Parent Message