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The Western Digital My Book Essential Edition is a portable storage solution, which boasts of high capacity and high reliability. We received the 500 GB edition. We were surprised initially, as we assumed this drive as Network Attached Storage Device (NAS) considering the high capacity, but it turned out to be a USB-interface portable storage solution.

It was no surprise that this is nothing more than a SATA Hard Disk Drive enclosed in the black casing. It housed the WD5000YS Caviar RE2 HDD, which we reviewed sometime back. It is one of the best hard disks around giving a score of 61 MB/s in SiSoft Sandra. Here is the image of the drive along with the enclosed casing.

Well, the WD5000YS can be clearly classified as Raptor 7200 RPM series. The Mean Time Between Failure (MTBF) has been rated at 1.2 million hours. It features a Rotary Acceleration Feed Forward (RAFF) that optimizes operation and performance when the drives are used in vibration-prone, multi-drive systems such as rack-mounted servers. A unique feature to WD Hard Disk is time-limited error recovery (TLER), which prevents drive fallout caused by the extended hard drive error-recovery processes common to desktop drives. Beside those, it supports the usual features like SATA interface, 1.5 Gb/s data transfer rate, native command queuing (NCQ), and 16 MB cache. None of these technologies are present in a standard desktop HDD. So, this isn't just everyday HDD.
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