If I assign it a H: then it appears below on the Devices and drives list, and if like this screenshot, I assign it an B: then it appears at the top of the Devices and drives list.
It will probably be just fine.Hopefully windows will treat it well and won't give any issues.
So far, I've had this setup like this for a few days now and all appears just fine, always wondered what should I do with this spare drive I had lying around since my other pc has no more space to fit another drive and I thought I was at max drives installed in this pc of mine, nobody wanted to buy it of me either, not until the other day when I decided to have a look for another sata power connection cable in my PSU's box, luckily I also had another sata data cable that had never been used.It will probably be just fine.
Me personally, I wouldn't.
I'm old school, and avoid A and B drive letters.