The SATA IDE adaptor attaches to the back of all ATAPI ATA 133 100 66 33 EIDE and IDE storage devices (such as a Hard Drive DVD DVD Writer CD-ROM CD Writer etc) and allows the device to become compliant with Serial ATA Host devices. Specification Serial ATA - 1.5 Gbps (150 MB/s) Compliant with Serial ATA 1.0 Specification Supports 48-bit LBA (Large Disk) hard drives larger than 137 GB Supports spread spectrum clocking to reduce EMI Compatible with all EIDE and IDE Devices