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I have a external USB HDD which is being displayed as one of the internal drives of my computer. It's not coming as removable disk. How to change this?

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Are you sure it's really USB, and not eSATA? eSATA is the "external" version of SATA. As a result, every OS has challenges in figuring out whether a given SATA drive is internal. – MSalters Jan 16 '12 at 11:33

This is normal behaviour as it's a hard disk, as opposed to flash based memory.

To remove safely, use the icon in the system tray, right-click and choose the disk there. This will spin the hard drive down for safe removal.

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