Just a little topic to ask what others are doing and perhaps to give ideas to those who have not thought about these options. Take a system like the PS2. Files sizes for roms can be rather large, so... This leaves a few options. 1) Have a massive drive to store iso's uncompressed 2) Have a massive drive and use ntfs compression 3) Compress the iso. 4) Archive Compress (.ZIP, .RAR, etc) - MASSIVE wait to uncompress..... I decided to have a look at compressed iso's. Daemon tools can mount isz files natively - so that was a good start. Here are some size comparisons on an iso. Uncompressed = 1.65g NTFS Compressed = 1.62g .ISZ Compressed = 1.55g .MOU Compressed = 1.51g .ZIP Compressed (for comparison) = 1.55g (Normal compression) Another - Uncompressed = 4.24g NTFS Compressed = 3.61g .ISZ Compressed = 2.62g .MOU Compressed = 2.62g Mou is a format supported by WinMount (a free application) that can also handle command line mounting (like Daemon). There is also a Japanese program (name eludes me now) that can also mount these files. I should also mention that all three (NTSF, ISZ, MOU) compression formats mentioned here mount instantly requiring no decompressing. Personal preference is .ISZ though. Of course, this kind of compression is only good for emu's that allow the running of mounted images (NullDC, PCSX2, Saturn, etc). Just thought I would post my findings as I would like to hear what others are doing (also if anyone knows of a batch .isz compressor/convertor).