[ubuntu-in] Changing external drive partition options- 2 queries

[Ramnarayan.K]

Hi

recently bought a 500 gig external usb hd for backup .

On this i made a few partitions , however i have one problem and one query

Problem is that all the partitions are not accessible in my normal
user mode - i have to go into sudo mode to access them.

How do i change the permissions to make it accessible to my default user

second query whenever i attach the device the various partitions pop
up, so is there a way of telling ubuntu not to pop up specific
partitions everythime they are attached. Meaning i would like usb
devices to pop up but in this case i want some specific paritions not
to pop up.

thanks
ram