Look up the commands to red hat, there should he a command to re partition the disk, but that wipes the OS also. If you have a copy of red hat you would be best off reinstalling. Actually if you have the OS on one disc and the saves in the other just partition the one with the games!
I would recommend NOT doing this under ANY circumstances- The core reason for not doing this is that over the lifespan of the TOOLs and PAs, Sony released numerous updates to the system. Sadly, no one appears to have archived these as they were on Sony's "confidential" BBS, and usually, RPMs that were to be applied, were applied, then disposed of. TOOL drive structure has about 3gb of system partitions partitions on a 20-40gb hdd- the rest of the drive is actually blank and unpartitioned, no real "work" or "temp" space. if a TOOL was used in production via codewarrior, prodg or the official sdk via remote access, there should be NO actual game data on the system, only a password (which is easily wiped by competent users) and the network settings needed to communicate with the network the device operated on. Both of these can be easily cleared/changed via the web console if one desires to hide the company that owned the systems. I have been working on a utility to extract the RPM's off tools such that they can be reinstalled/reimaged back to factory level, but there's no such thing as a factory install disk/image (yet). In addition, attempts to mix and match disk images between revisions of the TOOL can result in very problematic systems. T14k equipped tools need the proper combination of RPM's to drive the dvd emulator, and T15k Performance Analyzer TOOLs (blue systems) have a whole pile of extra hardware, drivers, and back end software needed to make them actually usable. at current, a TOOL with wiped drives is a brick to anyone purchasing it. (yes, with enough community help, the system can be revived, but not with the original system it was installed with- TOOLs left the factory with unique drives, each one being netinstalled based on the current revisions of the software in production at the time and the hardware in the system, NOT a binary drive clone) If you are wary about distributing confidential game data, the only worthwhile data you will find will be on T14k equipped TOOLs/T15k PA Emulator Drives. T14k equipped TOOLs will have a "SN Systems" Serial number tag on the back of one of the PCI slots on the system, and these drives could, potentially, have copies of a game disc, but the normal system drives found in pretty much every other TOOL (excluding the T15k) (unless used in a VERY UNSUPPORTED METHOD -- according to Sony), will be devoid of any data that can be used to leak betas of games, etc. Just my 2 cents.