MBP 15'' Mid 2009, Mavericks OSX 10.9.1, 64-Bit Kernel, Truecrypt 7.1a, Filesystem MAC OS Extended (Journaled) Have been using Truecrypt to create an encrypted drive on a file container with a "backdoor" function, i.e. two different passwords, one is opening the regular encrypted drive from the container with my data, the 2nd password is opening another encrypted drive with "other" data. Worked without any issues for years with SL, Lion, ML and now Mavericks. Last week, I upgraded to 8 GByte RAM and installed a 250 GByte Samsung SSD. Truecrypt still worked fine. Since yesterday, I am getting the following error when I want to mount my regular encrypted drive: hdiutil: attach failed - no mountable file systems The backdoor drive (from the same file container), I can open without any issues (it's an MS-DOS FAT32 format) Older versions of the same file, I can mount both without any problems - either from my internal SSD or from an external HD (both with Filesystem MAC OS Extended (Journaled)) Checked for solutions and installed OSXFUSE (as well as different versions of MACFUSE) and TUXERA NTFS, problem is remaining. Mounting as "read-only" is as well not possible. The regular encrypted file has around 2 GByte, the Backdoor drive has 4.29 GByte, both are in MS-DOS FAT32 Format, the Truecrypt Container which is hiding both encrypted drives has 4.29 GByte. Who can help?