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Using FDS Flash storage for user settings as well as for DFU

I am building on a BLE DFU project which already has a NRF_FSTORAGE_DEF for allocation of non-volatile data used by DFU.
I want to add another instance of NRF_FSTORAGE_DEF for use with application setting data.

Can I define two different regions in Flash for this purpose, or do all uses of NRF_FSTORAGE_DEF need to be in a contiguous block of Flash memory?

One problem is that m_fs is used for both instance - which is easily fixed by renaming the DFU one to m_dfu_fs to avoid a name conflict.

The DFU section is set to between 0x7F000 - 0x80000.

Can I set my other section to 0x20000 - 0x22000?

I tried this and it compiles and runs OK, but when the pages_init() function is called on initialization of the FDS module, all three pages are marked as FDS_PAGE_UNDEFINED and are not erased, so all three are discounted and the function returns NO_PAGES.

I have the following settings in sdk_config.h:

#define FDS_VIRTUAL_PAGES 3

#define FDS_VIRTUAL_PAGE_SIZE 1024

#define FDS_VIRTUAL_PAGES_RESERVED 0

Are these settings correct for what I need?

If the Flash fs_data section needs to be contiguous, how should the region be defined? In the project settings or in code (as is done for the DFU region)?

Thanks...

Declan Traill