how to properly mount an external usb hard drive & other questions

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hi all

i am using up to date debian sid with xfce desktop environment. i am using Linux 3.13-rc6-amd64 #1 SMP Debian 3.13~rc6-1~exp1 (2013-12-30) x86_64 GNU/Linux from experimental. i have installed usbmount to auto mount all the devices connected through USB.

[cmd# 1] i have created btrfs partition on my external USB hard drive using the following command :

# mkfs.btrfs -f -L btrfs -m single /dev/sdc
Turning ON incompat feature 'extref': increased hardlink limit per file to 65536
fs created label btrfs on /dev/sdc
	nodesize 16384 leafsize 16384 sectorsize 4096 size 931.51GiB
Btrfs v3.12

[cmd# 2] my permissions of the device :
# ls -l /dev/sdc
brw-rw---- 1 root floppy 8, 32 Jan  5 09:47 /dev/sdc

my questions :
[a] does the partition created by me is appropriate ?
[b] how do i specify lzo compression in fstab ? last time when i tried to create entry fstab it is complaining about the auto mounting of the device by automount. [c] what compression method is used by btrfs by default for the partitions created using the command mentioned above. [ cmd# 1]
[d] does the file permissions for my device are accurate ? [ cmd# 2]
[e] what is the appropriate fstab entry for my device ? [ i don't want to remove usbmount].
[f] should i use single or dup for the device ?

please provide suggestions for configuring my device appropriately. thank you for reading the message patiently.

please alway cc me.

regards,
wardhan.
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