How to make new partition on SD for media files ?

[mk01]

@kbarb

if you don't have 4TB big SD card, it make no sense (to use the SD).

beside the concept to rethink - btrfs is doing ALL operations online. so as you have XBian booted, simply shrink the FS, then in fdisk delete it's partition (mmcblk0p2). then immediatelly create new, smaller. and create the one you need.

but before formatting you have to reboot just for kernel to allow rereading of partitions. otherwise all tools will report you that p3 doesn't exists - you created it and saved on SD but p2 being mounted as root, kernel will refuse reread new info about the mmcblk0 media)

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you can image XBian back to partition.

the point is that XBian is trying to make the restore process easier. so IMG it create is not only IMG of partition, but complete setup as P1,P2 and of course correct partition table. so its clear if you write this to disk, even if IMG is smaller as your next partition begin, it will overwrite partition table - making other partitions to "disappear" until you would type them in again.

BUT you can of course just copy the P2 from IMG to your media. Why not? Although prepared will all benefits as working IMG, it is at the end still only /boot partition + data on second.