I'd go for one pulled from a Mac, as they're much easier to format. Otherwise, you will need something beyond your stock install disks to initialize the drive - something like Silverlining, or a patch (which is widely available) for the HD formatting software that came stock with Apple machines of your era.

A WD 7200 RPM drive is most likely going to be wasted on the scsi bus of a Q650 anyway.

Same seller:

http://cgi.ebay.ca/Quantum-Fireball-ST-4-3GB-50-PIN-SCSI-hard-drive-4310ST_W0QQitemZ140241880000QQihZ004QQcategoryZ168QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

I have one of these in my Q650 and it works exceedingly well: quiet, roomy, and perfectly snappy for its intended purposes. (It's partitioned into a couple of 2.x GB drives under MacOS7.6.1, which is necessary with a drive of this size under anything less than OS8.1, and makes for the most efficient use of space under any OS a 68k machine can run - since a Quadra can't boot from an HFS+ formatted drive).