[. . . ] Introduction to 2. 5" Portable HDD- H551 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main Features Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Revision History Revision A. 0 Date 2010/04/25 History New Creation Remark Important!!Please make sure the driver matches the part number on your pen drive before you download. One of following operation systems: Windows 98/98SE/Windows ME/Windows 2000/Windows XP The advertised memory capacity of this device represents unformatted capacity. Please note that once formatted and due to variations in flash module block limitations, the functional storage space will be lower than the advertised capacity. "PQI reserves the right to make changes without notification when fit, form, function, quality and reliability are not affected. The data sheets do not constitute contract documents and should not be considered part of the specification for purposes of any warranty. " 1. Introduction to H551 PQI releases 2. 5" external portable hard drive H551, featuring ultra slim frame, high quality sandblast treated design and diamond-cut logo for aesthetic looks. H551 is available in 320GB / 500GB / 640GB capacities, it comes with dedicated turbo boost software for efficient data transfer and personal file management software for effective management. Main Features Overview - Full USB 2. 0 compatibility (backward compatible with USB 1. 1) - Hot swappable, USB Plug & Play compatible - Support TurboHDD USB software - Support Ur-Smart personal file management software - Fashionable metallic casing 3. [. . . ] Pin Assignments Pin No. 1 2 3 Pin Name VBUS DM - USB DDP USB D+ Function Power supply Data input/output: The bidirectional I/O transfers address, data and instruction information Data input/output: The bidirectional I/O transfers address, data and instruction information 4 GND Ground Connection 9. Physical Specifications 9. 1 Dimensions: 9. 1. 1 Height: 118. 97mm± 0. 1mm 9. 1. 2 Width: 80. 07mm ± 0. 1mm 9. 1. 3 Depth: 13. 2mm ± 0. 1mm 9. 2 Outline of top view [. . . ]