home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!olivea!mintaka.lcs.mit.edu!hal.gnu.ai.mit.edu!ericy
- From: ericy@hal.gnu.ai.mit.edu (Eric Youngdale)
- Newsgroups: comp.os.linux
- Subject: Re: SLS is awesome and getting larger
- Message-ID: <1992Aug26.151143.13011@mintaka.lcs.mit.edu>
- Date: 26 Aug 92 15:11:43 GMT
- References: <1992Aug26.125143.17176@murdoch.acc.Virginia.EDU>
- Sender: news@mintaka.lcs.mit.edu
- Organization: /etc/organization
- Lines: 54
-
- In article <1992Aug26.125143.17176@murdoch.acc.Virginia.EDU> fh8n@uvacs.cs.Virginia.EDU (Frank Houston) writes:
- >Hello linux hackers
- >
- >I have just finished installing the SLS distribution of linux
- >over the weekend. Congratulation to linus and the authors
- >of sls. You guys give hackers a good name. The points is
- >SLS is now 15 disk and growing to morw than 20. Time to
- >go CDROM. On that subject DAK sells a CDROM with controller
- >for $199. I alspo received a compuadd catalog on Aug 20
- >that has a Cdrom and card for $169. So the price isn't
- >as steep. I know that there is a SCSI cdrom driver in development
- >, but they seem a lot more expensive.
- >
- > $150 for the Adaptec board supported.
- > $250 for the cheapest scsi cdrom.
- >
- >How about the linus community agree upon one of the minimaly
- >priced cdrom unix about and create drivers it. This would
- >create a defacto common linux cdrom drive.
- >
-
- I feel that I should warn everyone that DAK is in Chapter 11.
- For those of you overseas, this means that they have filed for protection
- from their creditors because they are unable to pay all of their bills,
- and Chapter 11 means that they want some breathing room so that they can
- (hopefully) get things reorganized and get their cash flow situation
- under control. The upshot is that it may take a long time for you to
- get any merchandise, and if they really go belly-up, you may never get
- your merchandise. It would be wise to pay by credit card if you purchase
- anything from them.
-
- The CDROM code that exists for linux now can be neatly divided
- into two parts. One part is the SCSI code to read the drive, and the second
- part is the filesystem. The filesystem itself should work with any block
- device, and in principle one could have the iso9660 filesystem on a hard disk
- or a floppy disk. The only device specific code in the filesystem is
- something to check and see if the disc has been changed, and this currently
- tests for major==11. The filesystem itself calls a function in the SCSI CDROM
- code to actually determine if the disc has been changed or not.
-
- The upshot is that all you would need to do is come up with a device
- driver for whatever type of interface is being used. The problem is that you
- need to know how to program the interface, so if it is proprietary you might as
- well forget it. Also, I would want to make sure that a secondary
- device/interface is actually becoming a standard before it would make sense to
- try and support it. If each of these really cheap drives all use a different
- interface, I would suggest spending the extra money for a SCSI drive.
-
- Some people have guessed that some of the cheap CDROM drives out there
- are actually on an IDE bus (this guess is based upon the connector), but
- I have not heard anything definite. I do not know if a IDE(?) CDROM can
- use the same controller as the hard disk.
-
- -Eric
-