Hidden OEM Partition cannot be mounted with a drive letter using Windows Disk Management. Using a Partition Management Tool to unhide such a hidden partition may be cumbersome. MountStorPE is a useful tool which mounts hidden partitions without unhiding it.

A USB Flash Drive can be disguised as a USB Hard Disk using Filter drivers. This way a USB Flash Drive can be partitioned using the inbuilt Disk Management Tool(diskmgmt.msc) and all the partitions of the USB Flash Drive can be accessed simultaneously in Windows Explorer.

A USB Flash Drive can be easily partitioned into a maximum of 4 partitions.All the partitions can also be accessed in Windows easily.This is possible using a tool called Bootice.

There are many ways and tools to hide or protect important data on a USB Flash Drive.However a simple format of the USB Flash Drive can erase the important data.
Using Fbinst, a hidden partition can be created to store important data.This hidden partition stays even after formatting the USB Flash Drive.

Windows could not read a faulty Seagate FreeAgent Drive.However Linux could read the same faulty drive without any problems.All the data was recovered using Ubuntu 11.04.No special recovery software was used.