The Datel Max Drive comes in three parts - two disks and a usb stick (pen drive/flash drive/whatever you might call it).
The usb stick.
This is just your basic pen drive. It can store up to 128Mb on it and can be replaced with any other usb stick if nessessary.
The PC disk.
To get yourself up and running, you'll firstly need to install the disk labled "For PC" on your pc. Once you've done that, that disk is pretty much unneeded but I'd reccommend you keep hold of it anyway incase you need to install it on another computer. If you wanted, you could just not install the software and keep everything on your usb stick but that really depends on how much you want stored.
The PS2 disk.
This is by far the most important part of the pack. If you lose or damage this, then you've pretty much got a usb drive and some useless software installed on your pc. This disk is inserted into the ps2 to enable the transfer of files from the memory card to your pc, or vice versa even. It will also offer you the option to crush/uncrush files and delete files
So if you really want to keep that replay of an amazing vollied goal on pes but you find yourself short on space on your memory card, or you find an option file using your pc and are wondering how to get it on to your ps2 easily, then look no further. The max drive will do that job and double up as a usb stick for general use if nessassary. You can't say fairer than that.