When you try to open a file or a folder on an external Sony Ultra Portable universal serial bus (USB) drive (model VGP-UHDP04) that is connected to a Windows Vista-based computer, you cannot access the file or the folder. Additionally, Windows Explorer stops responding. This problem occurs after you wake the Windows Vista-based computer from hibernation.

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This issue occurs because the USB port on the Windows Vista-based computer cannot detect the device speed of the USB drive.

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To work around this issue, use one of the following methods.

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Method 1

Disconnect the USB drive before you put the Windows Vista-based computer in hibernation.

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Method 2

Disable hibernation on the Windows Vista-based computer. To do this, follow these steps:

1.	Click Start, and then click Control Panel.
2.	In Control Panel, double-click System and Maintenance, and then click Power Options.
3.	Under Preferred plans, select the plan that you want to change, and then click Change Plan Settings.
4.	On the Edit Plan Settings page, click Change advanced power settings.
5.	In the Advanced Settings dialog box, expand Sleep, and then expand Hibernate.
6.	Click the menu next to Setting (Minutes), click Never, and then click OK.
7.	On the Edit Plan Settings page, click Save changes.

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The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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