|In the most polite sense he may have confused a flash drive with a hard drive.|
In some cases, some portable devices can't be accessed from windows if it has more than one partition (or rather the added partitions). The hard drive ought to be OK and you'd find out quickly if windows lets you or not. If it allows it then it is find to do.
I can't see a reason for me but it is fine for you to do if you so choose.
1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.