Partitions of the Android 4.4 ROM on a 32GB card
sdb1 - 28GB – mounts as sdcard folder
sdb2 - 16MB – [Volume] contains magic.bin and boot pictures
sdb3 - 3.3GB – Extended partition
sdb5 - 16MB - env
sdb6 - 16MB - boot
sdb7 - 768MB – mounts as /system/ folder
sdb8 - 1.1GB – mounts as /data/ folder
sdb9 - 16MB - misc
sdb10 - 32MB - recovery
sdb11 - 768MB – sysrecovery
sdb12 - 512MB – contains /cache/ folder
sdb13 - 16MB – [PRIVATE] is empty, msdos formated
sdb14 - 128MB – contains HWML folder
There is funky stuff going on in the partition table. gparted won't load it. You can list it with fdisk. I think to edit it you might need a hex editor.
(1) Had the dumb idea of overwritting the /system/ folder with one from a CyanogenMod ROM. Didn't work.
(2) Also tried to use dd to see if I could manually flash sdb6 with a CyanogenMod boot image. Didn't work.