For the time being unusable (update)

------------ First version of the review (update below) ------------
Oh that my Lenovo Thinkpad T520 with Win7-64 with USB3 instrumented so that I can use it mobile, ie without protruding card etc. The main purpose here, at different locations with external USB3 disks (different brand and unbranded Manufacturer, all create with external power supply) backups, and faster than with USB2 possible.
Card fits perfectly into the notebook, drivers can be installed, card is recognized, hard drives are detected. But as soon as a file that is larger than will copy about 1MB, I get one minute to think the message "Can not write disk defect" that happens with the Windows Explorer, with Total Commander and the Acronis True Image backup software. I have the write cache disabled, tried a (supposedly) new driver of the chip manufacturer, the USB Power Saving on and off, played the latest BIOS, NTFS and FAT32 drives tasted ... no change. Every now and then I get a few MB written that are not broken, but for a backup solution are typographical errors, and no matter how rare, of course, a no-go. All the same mouse and keyboard can connect I ... So I can the project as "have been nice if it were, a lot of effort, no result" tick. Returning for 14 euros is also more than tedious, besides, I have played around since mid-September, ie the purchase is a long time ago ...
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Update: CSL has offered me to send a second copy of the card, to test whether it has acted in my first at a defective card.
For the very efficient and friendly service +2 star ... if the new card does, of course, even more.

Update 2: the card has arrived with me, and the test by moving / copying large amounts of data with subsequent Prüfsummenvergleiche worked perfectly ... so the first copy must have been defective. Given the active and friendly service and a product now functioning full 5 stars.