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Question: This adapter will not work if I try to boot to the hard drive. It never shows up as a boot option, but works fine in Windows. Anyone know a fix?
Document: I have only used in Windows. Works great within Windows and definitely operates at usb 3.0 speed. Even better is that you can actually attach more than 1 hard drive and Windows will show all hard drives connected.The problem is that I cannot see my hard drives when I am not within Windows. If I try to boot to my hard drives, I cannot even see them. I have tested this on multiple computers and multiple usb 2.0 and 3.0 ports. It doesn't work.
I never got to try it but I don't think this cheap CoolGear USB 3.0 to SATA and IDE Hard Drive Adapter  could survive being dropped even once without breaking to bits.
It's easy to use, and it works well. I plugged my hard drive into the adapter, connected the adapter to its power supply, connected the adapter to a USB port on my PC then turned on the adapter's power. The hard drive began spinning, the computer recognized it, and windows loaded its directory data into the file system.
Even with this though, it only sometimes works. Usually when plugging the adapter in when not within Windows, the adapter will stop the computer from doing anything. It won't allow me to hit any keyboard keys or anything. Sometimes after waiting 10-15 seconds, the computer will work again. Sometimes, I have to actually remove the adapter in order for the computer to become responsive again.
Works great for hard drives. The connections don't work for CD or DVD drive (at least mine) without using a cable extender due to obstruction of the power plug, the connections are too close to use the coolgear by itself. Worked great on a hard drive. Noticeable difference in speed betweenCoolGear USB 3.0 to SATA and IDE Hard Drive Adapter Universal 2.5/3.5/5.25 Drivesthe 3.0 and 2.0 connection, both worked.
I was able to access my IDE hard drive with this thing. The only part I had a tough time with was accessing my files. I had to make the IDE Hard Drive recognize my new computer as the owner via the security section when you click on properties. I also had to make all the files share-able. But other than that, this device works like a piece of cake as long as you know what you're doing.
I looked at many of these on Amazon and was a little worried by the reviews, but it did the job just fine. Its a fragile little device, I can think of many ways to break it. I wouldnt leave it laying around, but for supervised usage its ok. The connectors aren't exactly a tight fit and it really doesn't work that great on a flat surface unless you match the drive height with the device using some foam or whatever under the drive you are working with.
If I was basing this review on just within Windows (I have yet to try Mac or Linux), then I would have given this 5 stars.
I have already given the 3rd laptop to a relative to salvage parts (including the hard drive) for his identical model so that his old system now works perfectly again.I have no regrets with this purchase of the The CoolGear Hard Drive Adapter from Amazon. In fact it has become a budding new hobby or perhaps even a business as I am now looking for opportunities to use it again.
Using Windows 7, I used the CoolGear USB 3.0 adapter for retrieving files from broken down old computers 2.5" SATA and 3.5" IDE hard drives. The adapter worked exactly as expected.
Answer: I have not used the Cool Gear adapter hard drive as boot up drive..., but have you adjusted your bios settings to allow boot up from a USB hard drive?