Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Does it work with windows 8.1?
Document: Worked on same laptop for win 7. Upgraded to win 8 and device driver software did not work. Loaded the drivers for it again still did not work. Uninstalled it and let win 8 load the drivers. Still nothing. Reimaged lc to win 7 and it worked. Plan on returning it for different product that is win 8 compatible.
This does NOT work at all on an Apple Computer.I called Transcend to verify this and they said it can't work on a Mac and to ship it back. So sad!I can't comment on if or how it works on a Windows Machine.
Did not work for sony vaio vgn fw 490 - windows 7 64-bit. "J-Tech Digital 2-Port ExpressCard SuperSpeed USB 3.0 Express Card Adapter for Laptop" did work.
I installed this on my Lenovo T410 running Windows 7. Immediately after installing (and possibly after one reboot) it will recharge my cellphone, but it did not work as a USB 3.0 port. I tried a few things, including uninstalling and reinstalling the drivers without success. I was going to give up on it, but on next reboot, everything worked perfectly.
Thank you to whoever it was that created this device. It's great that I can have 2 more ports on my laptop although it's supposed to be at 3.0 speed the transfer rate is still about the same as a SATA port. I guess it's still too much to ask to have a separate device do the work of a computer with a compatible motherboard for a 3.0 USB port. I have a Toshiba Satellite A665-6095, running Windows 7 x64 bit, 4gb ram.
All-in-all I am quite pleased with this and would recommend this product to anyone looking for extra USB ports with a faster transfer rate than a 2.0 USB and definitely a 1.0 USB. Here's the link for anyone having problems looking for the driver: [...]
However, it is a good idea to plug the drive into the card first anyway, because the insertion force for the USB connectors is much higher than for the Expresscard slot.This is an excellent choice for an external USB 3.0 drive with Windows 7.
I like Transcend but I've never found their flashdrives to really be particularly fast. I got this thing, installed it into my Windows XP laptop and well, it's not really giving me USB 3.0 speeds. I guess I'm not really all that surprised, but ... wow.
It didn't specify whether it's for PC or Mac, and eventually it didn't work for neither of my laptops. Very disappointed.
Some computers do not have USB 3.0. New 3.0 products do not work as fast when used in a 2,0 port. If you need this, you really need it. AND-- The price is good too!
Answer: Sorry, I don't know, I used it for my older laptop.  My new laptop already has 3.0 usb.  I had Windows 7 Ultimate on my old one.  Check the website.