Seagate Desktop HDD 250GB 3.5" Ultra ATA/100, 250 GB, 7200 RPM, 16 MB, 3.5", Ultra-ATA/100 Seagate Desktop HDD 250GB 3.5" Ultra ATA/100. HDD capacity: 250 GB, HDD speed: 7200 RPM, Storage drive buffer size: 16 MB, HDD size: 3.5", Interface: Ultra-ATA/100