Yes, they (PATA drives) are all in USB enclosures.
But now with SATA drives, I no longer buy the cases. Instead I use SATA cradles. They are faster (eSATA) and more convenient. I have three of them: 1 for the iDTV tuner box for playing 1080p videos, 1 for my laptop for playing DivX and 720p videos, and 1 for my personal computer. Much more convenient this way…and don’t have to waste money buying cases.