Even if the device is completely opened up, there is no way for unwanted eyes to see your information if they do not know the password. I-O Data also emphasizes the ease of use of this HDD. Because this device requires no installation, you can use it on any PC. There is a button on the side that opens the device and allows you to quickly bring up the password screen. If the password has been guessed incorrectly one hundred times in a row, the HDPNC-HSU will permanently lock. At this point, it needs a re-initialization to work again. The shock-resistant body of the HDPNC-HSU makes it able to put up with a little abuse (it passed the standard 70 cm drop test). This HDD is compatible with USB 2.0 and USB 1.1 interfaces. Though they have essentially the same specs, the HDPNC-HSU is ten grams heavier than the higher cost HDPNC-U (320g as opposed to 310g), and is not compatible with Mac operating systems. The I-O Data HDPNC-HSU 500GB HDD comes with a three year warranty.