It appears that this device is providing output banner after the doing the "show flash" and believe that is causing it to not to provide the partition on the GUI. See below:
XXXXXXXXXJ006#sh fl
11983 startup-config
12013 startup-config.bak
26751928 T900E3A-R10-9-5-E.biz
(dir) 400 Tones
27222016 bytes used*, 69898240 available**, 97120256 total
NOTICE: On-the-fly file compression is in use on this file system.