Have you been confronting OS X 10.5 no mountable file systems? This type of problem lead into inaccessibility of hard drive. In Macintosh DMG file is frequently used as disk image but it is treated as real disk. It needs to be mounted so that you can access hard drive data considerably. But sometimes due to someway while you try to mount DMG there may be unexpected error message appear as "No mountable File System". You must resolve OS X 10.5 no mountable file systems because it does not let you to access your hard drive that is quite devastating. Here one can consider checking disk integrity by using disk utility. But if the problem remain occur then go with formatting drive and make a fresh OS X installation. In consequence of that you would see all the stored data has been wiped out from the drive. In this difficult circumstance going with data recovery is the mere option left. If data backup available then it is fine else look to third party solution for complete recovery. Thankfully Mac Data Recovery Software enables you to bring lost data back in effective manner. This is the way to resolve OS X 10.5 no mountable file systems.
