Back in the day I used to spec disk storage (e.g. EMC Symmetrix) at around $1000/GB. Then I spent about 2 years away from the system sizing game. When I got back into the flow in Feb 2002 I looked around to figure out new rules of thumb for storage costs. On a continuum from cheap to pricey:

type	amount	cost	$/GB	source
Raw IDE disk (WD)	20GB	$100	$5	Staples
SCSI "shoebox" (Sun Multipack)	218GB	$5650	$26	Sun Store
low-end RAID (compaq 4100)	432GB	$15k	$36	Compaq website
mid-range RAID (Sun T3)	655GB	$84k	$128	Sun Store
high-end RAID (Sun 9960)	5800GB	$730k	$125	Sun Store

-- TobyCabot - 28 Feb 2002