Genuine GKDFK Dell/Samsung 256GB 1.8" inch uSATA SSD Solid State Thin Caseless Hard Drive Firmware: AXM08D1Q Compatible Part Numbers: GKDFK, 0GKDFK, MZUPA256HMDR-000D1, MZ-UPA2560/0D, SSDR, 256, S2, THM, PM810, SMSNG Genuine Dell/Samsung 256GB Hard Drive Form Factor: 1.8" Thin / Caseless /Firmware: AXM08D1Q / Model SSD 3.0GB/S Thin uSATA 256GB SSD (SATA3.0Gbps) Technical Specifications: Host Transfer Rate: 300MB/sec / Maximum Sequential Read Rate: 90MB/s / Average Access Time: 0.13ms / Voltage: 3.3V 5% / Interface: uSATA SSD / Capacity: 256 GB Compatible Part Numbers: GKDFK 0GKDFK, MZUPA256HMDR-000D1, Model Number: MZ-UPA2560/0D1 SSDR,256,S2,THM,PM810,SMSNG