I think my smallest is a 40GB 3,5" IDE drive. I had a cleanup a few weeks ago where I threw out all the crap I didn't need.
oldest used daily drive is Maxtor 200gb ( when they 1st came out ) currently running at 55deg with 59,000 Hours.
I have a 80mb ish WD drive that doesnt work sat around somewhere. For working drives I have a couple of 800MB IBM drives still working and a couple of 4GB Fujitsu drives.
My old Gateway 2000 has an 8GB HDD with Win 95 installed - it should still work (I haven't fired it up in years though. I remember it had partitions as IIRC Win 95 couldn't handle partitions over 5GB
My smallest and oldest is a 250 Gb Maxtor SATA 1 drive. I generally don't keep drives more than 2 years and give them to family for their systems as I'm always increasing storage and adding more and more drives to my PC.
currently have a western digital caviar 32500 which holds an impressive 2558.9mb and a seagate barracuda 7200.7 200gb drive installed, until I update my system shortly.
How about a SeagateST-325N - 20MB scsi I think i've had it for about 20 years I also have 2 of the Bigfoots both 2GB
I have a doorstop circa 1980 something which I think is about 8 or 10 MB, it's certainly not working any more though. It was in an IBM 8086 XT that went to a better place several years ago when I ran out of storage space. The oldest running one I have though is a 420 MB WD job that's in my 486 DX2 80 - it's still running and has Windows 3.11 over the top of DOS 6.2
I would have to check on the net to be honest. All I know is the sound it makes is weird and that my SSD is dwarfed by that damn thing EDIT: Mine is 3600rpm and yours could be a 3600 ot 4000rpm, depending on the version. Last year I plugged it on an IDE@SATA adapter and it worked. It was awesome to see the win95 logo for a second (before a blue screen) on a P5QL-Pro , an E8400, 4GB of DDR2 and a GTX260
Oldest one that still works is a 4 year old 500GB Samsung drive - still does the business nicely a a backup drive (and I only got it as my dad bought it without realising it is a SATA drive and the work PC he bought it for only supported PATA)
Oldest I have has sep/30/97 printed on the back, and holds 3.2GBs. got windows 95 on it i think, and as far as I know, it still works.
Seagate ST3660A from 1995. Total capacity: 545.5MB. It came from a Packard Bell Executive Multimedia PC and still has a copy of Windows 95 on it.
I have a 6.4GB Quantum Fireball that was the main drive in my first ever PC built around 1996. Still works.