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- Path: sparky!uunet!usc!rpi!bu.edu!wang!pvr
- From: pvr@wang.com (Peter Reilley)
- Newsgroups: comp.arch.storage
- Subject: Re: Questions on Tape Drives
- Message-ID: <bumda6.b0h@wang.com>
- Date: 15 Sep 92 12:27:41 GMT
- References: <44671@ucbvax.BERKELEY.EDU> <269@talgras.UUCP>
- Organization: Wang Labs, Lowell MA, USA
- Lines: 19
-
- uncal@talgras.UUCP (Al Amet) writes:
-
- >Actually you never want the tape to touch the head with any of them. The
- >object is to have just a few molecules of air between the head and the tape.
- >I use to have a chart that showed objects in reference to a 1/4" cartridge
- >head. A human fingerprint was several times the thickness of the distance
- >between the head and the tape. Head design is an art. The object is to
- >keep the tape wrapped around the head as close as possible without it
- >touching.
-
- All tape drives have their heads in contact with the media.
- The chart that you have describes disk heads, which do float on a
- thin layer of air. The only flexible media system that I am aware of
- that does use floating heads is the Bernouli drive. In tape drives
- the head does wear because of the media contact. Hard disk
- heads do not wear while the drive is running.
- --
- >>>>>>>>>>>> Peter Reilley ..... pvr@wiis.wang.com ..... KA1LAT <<<<<<<<<<<<<
- Well, that about says it.
-