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- Newsgroups: comp.os.os2.misc
- Path: sparky!uunet!mcsun!sunic!ericom!eddie.ericsson.se!etllnfr
- From: etllnfr@eddie.ericsson.se (Lyndon Fletcher)
- Subject: Re: ESDI hard drive
- Message-ID: <1993Jan11.193518.14819@ericsson.se>
- Sender: news@ericsson.se
- Nntp-Posting-Host: eddie.ericsson.se
- Organization: Ericsson Cellular Division
- References: <93008.191729CHM103@psuvm.psu.edu> <1993Jan9.021029.11598@twisto.eng.hou.compaq.com> <ricky.726670098@lindblat.cc.monash.edu.au>
- Date: Mon, 11 Jan 1993 19:35:18 GMT
- Lines: 37
-
-
- I've been looking into this and there appears to be two problems with
- using two different controllers.
-
- 1) The hardware of the two controllers uses the same physical addresses
- et al.
-
- 2) The IBM ROM BIOS only allows one controller to be used on a machine
- (SCSI's are different as we will see.)
-
- The reason you can use both a SCSI and an IDE drive is that the SCSI
- uses different hardware addresses from the IDE and a device driver is
- loaded in config.sys to allow dos to access the drive without calling
- the BIOS.
-
- There is a shareware DOS device driver that takes advantage of the fact
- that most controllers allow some alteration of their hardware addresses.
- For this to work the IDE would be set up as normal. The address of the
- second ESDI card would be set to another value. In the config.sys of the
- booting drive a line would be added to link in the device driver and the
- drives it uses will be allocated the next free drive letters. When the
- system has booted all requests for the ESDI drives will be routed through
- the device driver to the second controller.
-
- As the price of ESDI drives continues to fall this provides a cheap method of
- increasing disk storage. The DOS program is called 3_Drives (or 4_Drives)
- and is available from Archie. Now all we need is for some smart person to
- write a 32bit OS/2 device driver with the same functionality :-)
-
-
- Fletch
-
- --
- "All irregularities will be handled by the forces controlling each dimension.
- Trans-uranic heavy elements may not be used where there is Life. Medium atomic
- weights are available -- Gold, Lead, Copper, Jet, Diamond, Radium, Sapphire,
- Silver, and Steel. --- Sapphire and Steel have been assigned......."
-