[comp.sys.ibm.pc.misc] Problem w/disk I/O on i486 machine

olender@sor.CS.ColoState.Edu (Kurt Olender) (12/15/90)

I've just gotten a 486 (see configuration data below) and am having
some trouble with copying files between the hard disk and floppy drives
under OS/2.

Whenever I try to copy a large (i. e. > 10K) file from one of the floppies to
the hard disk or vice versa, I get a fatal error that halts the processor,
which is quite serious under OS/2 since it will normally be able to continue
under most error traps.

Copying files between the floppies works OK.  Copying files on the hard disk
is OK.  Only between the two are there any problems.

I suspect this may be due to some timing problem, since the internal system
clock is running very fast (gaining over 1 sec/sec!), and there is quite a
speed mismatch between a floppy and hard drive, but I'm not sure.  It may be
something totally unrelated.  Unfortunately, I can't test to see if I have
the same problem under DOS since my hard disk is formatted for HPFS.  I had
the same hard disk/floppies and controller on a 386 and had no problems with
OS/2 there.

Has anyone run into this problem?  Anyone have a possible solution?  Can
anyone tell me the proper setup parameters related to the clock and timing so
I can check if those are proper?

Thanks for any information you can provide.  Configuration data follows:

Giga-Byte GL486 motherboard, 
	25 MHz,
	8 MB RAM, 
	128K external cache, 
	OPTI chipset,
        AMI 486 BIOS 2.0B dated Aug 8, 1990.
Conner CP-102-A (104MB) IDE hard drive
Teac 1.2MB floppy
Sony 1.44MB floppy
Chicony 101 integrated floppy/IDE controller/COM/PRN port board