ASA-SM flash storage options

I've been trying to figure out which flash storage systems the ASA-SM can use for image and configuration management purposes. Of course I've checked the config guide (current is v8.5), the data sheet and the Q&A, yet it doesn't clearly answer specific qestions, like:
The documentation speaks about disk0: and disk1:...What are the internal and external flash stores?
How large is the internal flash store?
Where's the external flash store located at? According to the pictures, there's no external flash module bay on the ASA-SM itself...right?
Can one of the multiple addressable Cat6500 flash file systems be used as an external flash?
In case it's OK to use a Cat6500 file system as a shared flash (imagine using multiple ASA-SMs), which one will be addressed by default? Is there a default at all, is it configurable?
Thanks for any clarification
Toni

Dear Experts,
I am using SUP2T with the following IOS, do i need to upgrade the FPD, how i will know that i need to upgrade
the commands output are form the 6509 switch.
sh run | in boot
boot-start-marker
boot system flash bootdisk:
boot-end-marker
diagnostic bootup level minimal
dir from  the 6509 switch.
Directory of bootdisk:/
    1  -rw-    33554432  Aug 14 2014 14:24:14 +04:00  sea_console.dat
    2  -rw-   113733048  Aug 14 2014 14:31:08 +04:00  s2t54-ipservicesk9-mz.SPA.151-2.SY2.bin
    3  -rw-    33554432  Aug 14 2014 14:26:52 +04:00  sea_log.dat
    4  -rw-       25832  Oct 31 2014 13:20:30 +04:00  startup-config.converted_vs-20141031-092028
Still I have not installed ASA-SM in the switch the day of migration i will install the ASA-SM, how i will know that i have to upgrade the FPD ??? and what actually it is helping for ASA-SM ,??? i hope compatibility is perfect between 15.1 switch version and asa-sm 9.3.???
I have a separate chassis (test scenario) with me i will upgrade the asa, and asdm image so i can upload the fpd image also if you experts give me confirmation for the fpd.
S1#sh hw-module switch 1 all fpd
% No cards with FPD support can be found in the indicated chassis or Not in VSS mode.
Thanks

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