I have the EXACT same issue as the OP (freezing on 3gp files off a MicroSD card)
NOTE: Any version before 1.28 CAN recover these files but the names are missing (and some files are corrupt)
All versions after 1.27 can find the exact file / dir names but the recovery freezes at calculating time (with 100% CPU)
Here is the log, please take a look at this when you get a minute,
keep up the good work guys... 8 )
[2010-03-22 15:59:08] [INFO ] Recuva v1.36.479
[2010-03-22 15:59:08] [INFO ] System Info: MS Windows Vista Home Premium SP2, Intel Core2 Duo CPU P8600 @ 2.40GHz, 4.0GB RAM, NVIDIA GeForce 9600M GT
[2010-03-22 15:59:10] [INFO ] No update available
[2010-03-22 15:59:26] [INFO ] Boot sector:
6/6QZnNpbTUuNjEAAiABAAIAAgAA+OsAIAACAAAAAAAAYB0AAAApU7QAACAgICAgICAgICAgRkFU
MTYgICAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAVao=
[2010-03-22 15:59:26] [INFO ] FS type detected by BPB parameters, OEM name fsim5.61 is unknown.
[2010-03-22 15:59:26] [INFO ] Processing folders from 0
[2010-03-22 15:59:27] [INFO ] Analyzing damage
[2010-03-22 15:59:27] [INFO ] 136 deleted files, 961 filesystem objects
[2010-03-22 15:59:27] [INFO ] Processing deleted emails
[2010-03-22 15:59:27] [INFO ] Processing recycle bin
[2010-03-22 15:59:27] [INFO ] Returning list
[2010-03-22 15:59:27] [INFO ] 109 / 31
[2010-03-22 15:59:27] [INFO ] Exiting scan