Ok i just tried something by curiosity... Could bring out some ingenious idea for somebody in this forum
I connected to my ps3 an external dvd drive with a dvd-video on usb and of course it doesn't work... possible cause would be that the PS3 allow only mass storage product to be connected and then check the file format of those device or that CDFS/ ISO 9660 is maybe not allowed on usb.
I didn't check with an external blu ray drive since i don't own one. The file system is different on BDR drive... it's Universal Disk Format (UDF) is an implementation of the specification known as ISO/IEC 13346 and ECMA-167 and maybe that could work.
the cdfs have a 4 GiB file size limit. However, it's possible to circumvent this limitation.
Then i read an article of wikipedia and i thought that maybe an homebrew could be made to allow such file system to work. " For example, the free software such as infrarecorder and mkisofs as well as Roxio Toast are able to create ISO 9660 filesystems that use multi-extent files to store files larger than 4 GB on appropriate media such as recordable DVDs." using this kind of program on a ps3 could cheat the actual hdd formatted in Fat32. the file will actually be splitted in the drive but used as one since the program emulate the file system... this will probably not allow to play game (but since backup manager could be executed before executing a game, there is a maybe a little chance) that could probably allow to play some video file without the limit or a splitting method...
All numbers in ISO 9660 file systems except the single byte value used for the GMT offset are unsigned numbers. As the length of a file's extent on disk is stored in a 32 bit value, it allows for a maximum length of less than 4 GB (more precisely, less than 4 GiB). (Note: Some older operating systems may handle such values incorrectly (i.e., signed instead of unsigned), which would make it impossible to access files larger than 2 GB in size.)
Based on this, it is often assumed that a file on an ISO 9660 formatted disc cannot be larger than 232 in size, as the file's size is stored in an unsigned 32 bit value, for which 232 is the maximum.
It is, however, possible to circumvent this limitation by using the multi-extent (fragmentation) feature of ISO 9660 Level 3 and create ISO 9600 filesystems and single files up to 8 TB. With this, files larger than 4 GB can be split up into multiple extents (sequential series of sectors), each not exceeding the 4 GB limit. For example, the free software such as infrarecorder and mkisofs as well as Roxio Toast are able to create ISO 9660 filesystems that use multi-extent files to store files larger than 4 GB on appropriate media such as recordable DVDs.
Empirical tests with a 4.2 GB fragmented file on a DVD media have shown that Microsoft Windows XP supports this, while Mac OS X (as of 10.4.8) does not handle this case properly. In the case of Mac OS X, the driver appears not to support file fragmentation at all (i.e. it only supports ISO 9660 Level 2 but not Level 3). Linux supports multiple extents. FreeBSD only shows and reads the last extent of a multi-extent file.