CDC disk and 3650 Questions

[Wally Mann <wbm@COYOTE.STANFORD.EDU>]

We have two Symbolics 3650's with dead CDC drives and are comparing
two alternatives to breathe life into the machines.  

One is to simply have the disks repaired, but we are concerned with 
reliability of the CDC disks.  We have the smaller (approx 300MB) drives.  
We have "heard" that the older CDC disks (which we may have) were 
unreliable, but the newer ones are much improved.  
Can anyone verify this statement?  If you have an old drive repaired,
will it be upgraded to the quality of the newer ones?

Our other option is to install Eagles on the 3650 (after upgrading
the FEP).  For $500 Symbolics will provide us with an IFS tape
for the Eagle.  Does anyone have a version of the renegade 
Eagle formatting software (ifs.lisp) that will work with 3650's?
They have a different software format than the 3600's.

Thanks,
Wally Mann
wbm@coyote.stanford.edu