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.

Sometimes you may require only some particular files inside an ISO. So downloading an entire ISO just for a few files is a big waste of bandwidth .Sometimes you may also want to know the contents of an ISO before downloading it.In such circumstances Httpdisk is very useful. Httpdisk mounts an ISO file stored somewhere in the internet to a virtual CD Drive in your computer without downloading the entire ISO file. You can then view and copy the contents of the ISO in your computer.

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.

Transcend JetFlash JF620 USB Flash Drives have a 11mb CDFS partition containing SecureDrive and other files.Many people do not want this CDFS partition.Officially this CDFS partition cannot be removed or modified.However there is a way to remove or modify this CDFS partition.