And again, it seems that some manufacturers don't even have a basic sense of security. The BIO-250U has a reason for that: as I stated in my previous review, it's almost impossible to do a fingerprint-scan leading to the unlocking of a drive in software without introducing serious security flaws, and the meagre 8-bit processor contained in the enclosure just isn't powerful enough to do fingerprint-matching. Given this hardware, this solution was the best the engineers could do, and as long as you see the HD as a gadget or toy, it is enough.
The iUSBs failure to keep its data secret is way worse, though. Strong encryption using a password and software-based authentication and decrypting is something that was perfected a long time ago: free software like TrueCrypt, LUKS and many others have implemented it securily. Therefore, it is inexcusable that a device for which you pay extra has this kind of hole in its security. To give an indication of how secure both devices are: it's almost trivial to create a downloadable program which anyone could use to get to the 'secret' data on both HDs
The conclusion of this hacker: If you're interested in the gadget-ness of a fingerprint-unlockable HD, you can consider the BIO-250U. While it isn't secure by a long shot, I can understand that using your finger to unlock your data at least is interesting. If you like the iUSB because of its looks, its price or its backup features, go ahead and buy it. If you're looking for something even a tiny bit secure, though, buy a standard USB-drive and use something like TrueCrypt. It isn't perfect, but at least it won't reveal your data by flipping one byte in memory.
I'd like to thank Bjorn Heirman from mobile-harddisk.nl, the shop selling these (and many other) USB harddisks for offering me these HDs and allowing me to publish the results.