Date: Thu, 27 Jan 2000 10:55:10 +1030 From: Greg Lehey <grog@lemis.com> To: Matthew Jacob <mjacob@feral.com> Cc: Palle Girgensohn <girgen@partitur.se>, "Louis A. Mamakos" <louie@TransSys.COM>, freebsd-scsi@FreeBSD.ORG Subject: Re: cannot mt retension (seagate python) Message-ID: <20000127105510.H53307@freebie.lemis.com> In-Reply-To: <Pine.BSF.4.10.10001261616590.62527-100000@beppo.feral.com> References: <20000127092913.C53307@freebie.lemis.com> <Pine.BSF.4.10.10001261616590.62527-100000@beppo.feral.com>
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On Wednesday, 26 January 2000 at 16:17:43 -0800, Matt Jacob wrote: > >> On Wednesday, 26 January 2000 at 14:33:37 -0800, Matt Jacob wrote: >>>>> Hmm... my tapes sometimes jam. I though a retension would help, but >>>>> I guess I have to calculate on a certain amount of failure. >>>> >>>> No, this is a problem with your drive. This shouldn't happen, and >>>> it's a bad sign. >>> >>> This happens with some frequency with DAT. Regular head cleaning >>> helps, >> >> That depends on what's causing the jamming. I've never seen any >> relationship between jamming and head cleaning. > > If enough gunk builds up on the heads, the tape lifts off slightly > and starts a roll which can get reverse wrapped around a capstan > roller. I've seen this on other tapes, but not helical scan. By the time this happens on a helical scan tape, I would imagine that the read errors would make it inoperative. I *have* seen serious problems with DDS drives, including jamming, but they have happened about equally with cleaned and uncleaned tapes. Greg -- Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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