SD card and massive thumbnail file issue

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http://forum.xda-developers.com – I have 2 issues 1. I have a 64GB microSD card which is formated with exFAT. It works fine in the phone but it is not detected in the recovery. Recovery says failed to mount sdcard 2. There is massive thumbnail file in the Internat SD of about 3GB. Is this behaviour normal? I am currently using ultimate rom 5.0 which uses Jellybean 4.1.2 XLSA with Philz kernel and his recovery. Please throw some light how i can fix these issue. Thanks (HowTos)