Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!tut.cis.ohio-state.edu!ucbvax!hplabs!hp-pcd!hpfcso!hpfcmgw!rocky
From: rocky@hpfcmgw.HP.COM (Rocky Craig)
Newsgroups: comp.sys.hp
Subject: Re: 20Gb OPTICAL INFO
Message-ID: <1080137@hpfcmgw.HP.COM>
Date: 28 Mar 90 02:40:07 GMT
References: <1990Mar14.183210.915@ux1.cso.uiuc.edu>
Organization: HP Fort Collins, CO
Lines: 27

> ...my understanding is that the jukebox
> looks like one massive 20GB device and the info on where each file is
> located is stored in the superblock.

This is not correct.  You can individually mount(1M) each SURFACE of a 
single disk as a file system.  The 7.0 driver(s) take care of grabbing
the correct media, flipping it around, etc., so that access to the
many filesystems is transparent (if not immediate :-) to the user.

Number of disks: 32 max \   so there are up to 64 filesystems available
Sides per disk:   2	/   in a "loaded" autochanger

Bytes per side:  325 megabytes (the maximum size for a single filesystem)

20 Gigabytes is 32 * 2 * 325 megabytes.  I believe you can actually mount
all 64 filesystems (but what an fsck nightmare!!!!)

Rocky Craig			
Hewlett-Packard Workstation Group, Marketing Event Technical Support
3404 E. Harmony Road, Ft. Collins, Colorado 80525-9599

Internet:	rocky%hpfcmr@hplabs.hp.com
UUCP:		...!{hplabs | hpu*}!hpfcmr!rocky

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