2X Imation SuperDisk Drive

Here's a photo on CDW--all ice colored. But what does the 2X mean? The description doesn't say. Does it just mean that it can be used with an iMac AND a B&W PowerMac G3 Pro? No. According to Imation disks rotate nearly twice as fast making the drive function some 70 per cent faster due to USB limitations. [Dana Baggett via MacNN]