Eric, I should have addressed some of your first-post's issues that I skipped over. "Slave" and "Master" drives are for installing IDE Drives - old styles, not newer SATA Drives. You may still see "Slave" and "Master" designations used when computers boot up and display a list of multiple drives, but those are only because that computer is using "IDE Standards" for SATA Drives - that's a BIOS-Display or Software-Only issue - not a hardware one that you need to pay attention to during installs.
SATA has one connector per device, so there's no Master or Slave settings anymore.
When you'd written you were going to put the HP drive "in" the Dell, I didn't realize you meant ACTUALLY IN. "Notebook? With multiple drive bays?" Oh yes, I see...
If that's the case, there's no need for any external shells or USB-to-SATA converter kits. You can slip it in, go into BIOS and make sure the BIOS 'sees' the 2nd drive, and "SAVE CHANGES=YES" and then let it restart. Windows should see that 2nd drive.
It will boot off of only your first drive - because that's what it's been told to do. Then, you can copy off the HP's files onto the Dell's, and I would still sooner-than-later reformat that HP completely.
Death Among External Devices... one of the issues that Windows tries to address with the "proper procedure to remove connected USB devices" is that the connector has a small amount of electricity flowing thru it. The "proper removal process" shuts this small data and electrical signals down completely.
Most devices are unaffected, either way, but eventually, a connector will object and "die". The bad thing is - "What if the dead connector is in my PC? Not my external device, but my motherboard's USB port?"
Yeah. No way to 'fix' it either.
I think this is one way USB and external devices "die" - the quality of parts they use will always be on the lower-side, so are more prone to any behaviors that aren't 'perfect'.