If you have lots of different drives connected to your computer, like hard drives, usb drives, network drives, CD or DVD drives and flash cards then you might have noticed that the functionality to manage those drives effectively is severely limited in Windows. Drive Manager is trying to change that by providing one interface for all connected drives.
The portable software will display a list of all connected drives upon execution listing information like the drive letter, available and used disk space, the drive type, the percentage of free space and the vendor and the product ID. Certain types of drives (local, CD/DVD, removable, network, not mounted) can be excluded from the display to optimize it further.
A double-click on a drive will open the root directory of the drive in Windows Explorer. More interesting than that are probably the Disk Info and SMART buttons in the main toolbar which display a wealth of information about the selected drive.

Additional options include the ability to hide drives in Windows Explorer and to use the Subst command to create a drive letter for a local folder. There are also options to map network drives, check and benchmark hard drives, eject or lock optical drives and links to tools like defrag. All of these options are available from the main interface of the drive manager application.
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This looks like an exact copy of KDiskFree, the stupidly-named Disk Manager in KDE. Of course, KDiskFree is included in every Linux distro that uses KDE.
I liked this one initially but it had not seen much actual use in my set of portable so I dropped it later.
One of those nice apps that don’t have specific (and useful) purpose.
@Rarst:
Would you like to share what other portable apps you use? Links, please!
@Dotan Cohen
That would be lots of links, I try to keep everything portable. :) I am covering my fave ones at my blog bit by bit:
http://www.rarst.net/tag/portable/
Thanks, Rarst! I don’t own a Windows computer but I am often asked to fix them, so portable software helps in those cases.