This USB2.0 PCMCIA cards are powered by the internal 5V. Many laptops have this power supply Although designed for PCMCIA cards, but not for it to pump iron in order USB hard drives etc.. Since the 5V can be used internally for other things to bring various Laptops with plugging a power-hungry to stick (eg. Freeview) to crash. These adapters are therefore something to use with caution. USB hard drives with a Y-cable to run on IBM T30 very well when you plug in the power cable to the rear USB 1.1 port and the data cable to the PCMCIA card. For this you need a 20cm extension if necessary. Alternatively, the USB cable when connected to both ends of an A-type plug has also use "reverse".
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Addendum December 2012:
Although card worked for a while (about 2 weeks) without any problems, then constantly went the file system on the connected USB sticks broken. That you can not even be sure that the adapter works permanently if he works on the first try. Mess something. Product has been returned.