Seagate Desktop HDD Barracuda 7200.10 320GB ATA100 20pk bulk, 320 GB, 7200 RPM, 16 MB, 3.5", Ultra-ATA/100 Seagate Desktop HDD Barracuda 7200.10 320GB ATA100 20pk bulk. HDD capacity: 320 GB, HDD speed: 7200 RPM, Storage drive buffer size: 16 MB, HDD size: 3.5", Interface: Ultra-ATA/100