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The HDD works fine on Windows 7 but it cannot be seen on windows xp sp2.

In Device Manager, it shows yellow exclaimination marks "USB Device". It also cannot be seen in Disk Manager.

I find several update on chipset drivers (ASUS P4V8X-MX) but it doesn't seem to help at all. Please help me on this.

Thank you.

(PS. S/N of the HDD is 75571114114951. I don't understand why the download page in the web said that it is invalid.)

Windows XP cannot recognize GPT partition tables, only DOS partition tables.

Windows 7 can read GPT partition tables.  If the disk was formatted under Win 7, most likely it has a GPT partition table.

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ESCHER wrote:

Windows XP cannot recognize GPT partition tables, only DOS partition tables.

Windows 7 can read GPT partition tables.  If the disk was formatted under Win 7, most likely it has a GPT partition table.

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That is not the case as the OP states that the USB drive can't been seen in either the device manager or the disk manager

Note: http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/guid_partition_table.mspx?mfr=true

"GPT disks appear as basic MBR disks with a single partition covering the whole disk, but the data on the partition cannot be accessed"