Disk Subsystem system bus disk controller disks Multiple disks connected to a computer system through a controller Controllers functionality(checksum,bad sector remapping)often carried out by individual disks;reduces load on controller Disk interface standards families ATA (AT adaptor)range of standards SATA(Serial ATA) SCSI(Small Computer System Interconnect)range of standards Several variants of each standard(different speeds and capabilities) Database System Concepts -5th Edition,Oct 23,2005. 11.14 @Silberschatz,Korth and SudarshanDatabase System Concepts - 5 11.14 ©Silberschatz, Korth and Sudarshan th Edition, Oct 23, 2005. Disk Subsystem Multiple disks connected to a computer system through a controller Controllers functionality (checksum, bad sector remapping) often carried out by individual disks; reduces load on controller Disk interface standards families ATA (AT adaptor) range of standards SATA (Serial ATA) SCSI (Small Computer System Interconnect) range of standards Several variants of each standard (different speeds and capabilities)