I found an interesting message regarding compact flash cards and the IBM z50 at http://www.brighthand.com/ubb/Forum10/HTML/000002-4.htmlI tried one of the methods that Gary_1 posted to that thread (his message is somewhere in the middle of the document), which involved removing the atadisk.dll driver. His method involved an IBM-only utility, though, but I soon found that I didn't need it.
Here's my modified method:
-remove atadisk.dll from the Windows directory
-go into Suspend mode and remove the CF card
-bring the Clio back out of Suspend mode, then close all open programs
-while the Clio is still on (not in Suspend mode), hit the Reset button on the bottom
-after the Reset procedure is complete, Suspend the Clio again
-place the CF card back inside
It works!!