18" Dual Drive Ultra ATA IDE Hard Drive Cable 2 Device IDE Flat Ribbon Cable - 40 wire - 40 pin Most IDE hard drivs have 1 pin missing on their connector. That s why the cables have one pin blocked. This dual drive IDE cable lets you connect two ATA 66/100/133 drives to a computer IDE port, as Master and Slave drives. This high quality flat ribbon-style IDE cable is the ideal solution for connecting hard disk drives, CD-ROMs, Tape Backup drives, Zip drives, DVD-ROM, or any ATA peripheral to your IDE capable computer. Specifications: Connect your IDE device to your motherboard or host controller. Each cable features 40-pin socket-to-socket connections and meets or exceeds all industry specifications. IDE ribbon cables are designed for use with IDE/ATAPI hard drives, CD-ROMs, CD-R/CD-RWs, tape drives, zip drives, LS-120s and other IDE/ATAPI devices. 40 wire ribbon cable 3 x 40 pin connectors CONNECTOR(S) Connector A1 x IDE (40 Pin, EIDE/PATA) Female Connector B2 x IDE (40 Pin, EIDE/PATA) Female One center pin blocked Cable length: 18". 12 and 6 inches between connectors