Restore Verifyonly

This operation

• checks to make sure that a backup is intact physically
• ensures that all the files in the backup set is readable and can be restored
• Does not verify the structure of the data on the backup. However, if the backup was created using WITH CHECKSUMS, verifying the backup using WITH CHECKSUMS can provide a good indication of the reliability of the data on the backup

Checks performed by RESTORE VERIFYONLY include:

• That the backup set is complete and all volumes are readable.
• Some header fields of database pages, such as the page ID (as if it were about to write the data).
• Checksum (if present on the media).
• Checking for sufficient space on destination devices.

RESTORE VERIFYONLY FROMDISK=‘c:\sqlskills\broken2005.bck’;

GO

Source:http://msdn.microsoft.com/en-us/library/ms188902.aspx