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Received: from fog.ccsf.cc.ca.us by bat-gwmta.ccsf.edu; Wed, 09 Jul 2003 08:03:39 -0700 Received: from ns7.ccsf.cc.ca.us (ns7.ccsf.cc.ca.us [147.144.1.250]) by fog.ccsf.cc.ca.us (8.11.3/8.11.3) with ESMTP id h69F3c226888; Wed, 9 Jul 2003 08:03:38 -0700 (PDT) Received: from listserv.dartmouth.edu (listserv.dartmouth.edu [129.170.17.24]) by ns7.ccsf.cc.ca.us (8.11.6/8.11.6) with ESMTP id h69F3cx23473; Wed, 9 Jul 2003 08:03:38 -0700 (PDT) Received: from Madrid (listserv.dartmouth.edu) by listserv.dartmouth.edu (LSMTP for Windows NT v1.1b) with SMTP id <0.0062E40A@listserv.dartmouth.edu>; Wed, 9 Jul 2003 11:03:27 -0400 Received: from LISTSERV.DARTMOUTH.EDU by LISTSERV.DARTMOUTH.EDU (LISTSERV-TCP/IP release 1.8e) with spool id 1076391 for LLTI@LISTSERV.DARTMOUTH.EDU; Wed, 9 Jul 2003 11:03:27 -0400 Received: from mailhub2.dartmouth.edu by listserv.dartmouth.edu (LSMTP for Windows NT v1.1b) with SMTP id <0.0062E400@listserv.dartmouth.edu>; Wed, 9 Jul 2003 11:03:26 -0400 Received: from newdancer.Dartmouth.EDU (newdancer [129.170.208.31]) by mailhub2.dartmouth.edu (8.12.8+DND/8.12.8) with ESMTP id h69EHRPu259152 for ; Wed, 9 Jul 2003 11:02:59 -0400 (EDT) MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-MailScanner: No virus detected by mailhub2.Dartmouth.EDU Approved-By: LLTI-Editor Message-ID: <14219967@newdancer.Dartmouth.EDU> Date: Wed, 9 Jul 2003 11:02:57 EDT Reply-To: Language Learning and Technology International Information Forum Sender: Language Learning and Technology International Information Forum From: LLTI-Editor Subject: Re: #7188.1 Using Disk Images of Language CD ROMS in Lab (!) To: LLTI@LISTSERV.DARTMOUTH.EDU Precedence: list --- Forwarded Message from Jack Burston = --- >Date: Mon, 07 Jul 2003 11:04:31 -0400 >From: Jack Burston >Subject: Re: #7188 Using Disk Images of Language CD ROMS in Lab >In-reply-to: <14120493@newdancer.Dartmouth.EDU> >To: Language Learning and Technology International Information = Forum >User-Agent: Microsoft-Entourage/10.1.0.2006 ------------------ Dear Joseph, Centralizing you CD resources to a server is a great way to avoid = the hassles of keeping CDs in local drives (and distributing them to = students for this purpose). I looked into this rather extensively last year = and can report that, while it can be done, it requires considerably more = than redirecting the path to your CDs. Dumping the CD to a hard disk is = easy enough, but programs that require the CD to remain in the drive = typically make internal calls to resources which are located in fixed = locations on the CD and these can't simply be rerouted through the OS. There are basically three solutions to the problem: 1) CD/DVD Disk changer 2) CD/DVD Disk jukebox 3) Virtual CD/DVD jukebox The following URL gives a good description of these options: http://www.kintronics.com/jukebox.html Basically, a disk changer contains a single CD/DVD reader plus a = carrousel mechanism that rotates disks (usually no more than 5) into place. = This is the cheapest solution, but also the slowest and restricted to a = single user at a time. =20 A disk jukebox contains multiple CD/DVD readers and can serve as = many simultaneous users as there are disk drives. It is also possible = to use disk changers in a jukebox, for example storing 35 disks in 7 = changers. While a jukebox can serve multiple simultaneous users, no user can = access the same CD at the same time unless multiple copies are stored. The most versatile solution to CD/DVD storage and distribution is = the virtual jukebox. In essence, this is a dedicated multimedia server = upon which CD/DVD content is stored in large, fast hard disks. The trick = here is special software that in effect tricks the computer into thinking = that a hard disk folder containing the CD/DVD contents is actually a CD = drive. Because they are hard disk based, virtual jukeboxes can serve any combination of the same or different CD/DVD disks to as many users = as network bandwidth will allow. The amount of bandwidth needed will, = above all, depend on the quantity and quality of video resources needing = to be distributed. In my trials last year with a top end PrimeArray = server (see URL below), I was able to successfully serve up full-screen MPEG = video to 32 computers over a IGB backbone with a switched 100 BaseT connection = to each station. Incidentally, with regard to DVDs, it has to be kept in = mind that (aside from copyright restrictions) commercial DVDs will normally = scramble any attempt to copy them to a hard disk. Lastly, as might be = expected, the versatility of a virtual jukebox come at a price: $5000-$10,000 = depending on CPU and the size and speed of hard disks. Aside from Kintronics (indicated above), there are two other = producers of virtual jukeboxes of which I am aware: PrimeArray http://www.primearray.com/). Be advised though that a = Virtual Jukebox http://www.cdcomputer.com/Virtual%20Jukebox.htm I trust you find the above of some use. Jack --=20 Jack Burston, Ph.D. Director=20 Foreign Language Technology Center College of Liberal Arts Rochester Institute of Technology 92 Lomb Memorial Drive Rochester, NY 14623-5604 Phone: (585) 475-3156 Fax: (585) 475-7120