Recommended Disk Space for CLM Application Server ?

It really depends if you have also database server on the same machine. Database consumes sometimes even more than 100 GB if you use RQM.
Except database, there is full text index stored on the machines. To sum up for standard deployments (up to 50 users) 10GB should be enough without database.

Referring to the CLM Systems Requirements and to the CLM Sizing guide ... In the case of the 'Single server setup' (dual tier database), 'Mid Scale Enterprise Configuration' Test -->
What is the Application Server recommended DISK SPACE (not RAM) ?

(how much disk space was used during the Test ?)
Thanks

I think disc space is a matter of what you plan to do.

Eg are you planning to use websphere or tomcat?- are you havving you database on the same server as the application server ? - are you going to leave the install files on the machine for quick recovery ? are you installing a single or all clm products ? are you planning to have workitem indexes locally or on a remote share?
If you are not installing DB locally but just want a full clm with local indexes and keeping the installfiles running on WAS I think 60 GB should do it - that should also leave you a bit of space if you want to perform an export at a given time.

Is there any disk sizing information that will enable you to plan for a starter disk storage size. Do you need 1 GB or 10 GB or 100 GB or 10 Terrabytes allocated for the Linux volume to support a starter team of 50 - 100 members using WAS and DB2?