Re: FatFs for external SPI Flash on PIC32MM
Looks as if you have to find out how to "format" the Winbond chip prior applying FatFs :)
As 8 MByte SD cards never (?) existed, this might require you to fully understand how a FatFs medium is organized. Good luck with that!
PEBKAC / EBKAC / POBCAK / PICNIC (eventually see en.wikipedia.org)