Western Digital markets drives with 320GB platters

Western Digital announced in late January the production of platters of 320GB for 3,5" disks.They just started marketing products using these platters.
They are simply made, and are replacing the old disks of 250 and 500 gigabytes with 320 and 640 GB respectively without a significant increase of cost.
Both of these capacities represent the bulk of their sales both in the trade and as OEMs.
One can expect that soon enough the discs 750 and 1 Go will follow the same path and will be replaced by products of 980 GB and 1.3 TB
Note that in contest for the most extensive capacity per platter, Samsung still holds the lead with 334 GB per platter, which allows them to offer the F1 with only 1 to 3 plateaus.
The disc manufacturer have rushed ahead to increase capacity. They are forced by competition between them to reduce prices (1 TB disk sells for around € 200), but they must also make grea advances in order to delay the emergence of SSD drives.