hard disk economy

Over the past few weeks I've bought a handful of Western Digital 500GB hard disks for various clients to use as rdiff-backup targets and also for use with mythtv at home. As a kind of might-be-interesting exercise, I kept an eye on hard disk prices at my local CPL to see if there might be more or less opportune moments to buy disks.

The prices used in the price per GB calculation are for the cheapest SATA model of a specific size.

The resulting graph is mainly unsurprising: