Price of comparable high-end PC vs. Sun SLC

[bdsz at cbnewsl.att.com]

In article <1990Sep4.232304.16861 at rice.edu>, oliveau at cs.ucla.edu (Greg Oliveau) writes:
> They just cancelled their 327MB Disk/150MB Tape
> package and are now selling a 669MB Disk/150MB Tape package for $6500!...

On a whim, I looked up the price of a 600+ MB SCSI DISK in Computer
Shopper and found several for about $2300. Does anyone know what disk SUN
uses? Is there a compatible disk? What about replacements for the 104MB
SCSI drive, and the 150 MB Tape unit?