portable extenal hdd

i have segate 320 gb hdd it is in 320 gb primary partition i want to make partition of 160 gb thanks in advance

 

Is it new? If it is, you can just make two partitions using disk management. If it already has data on it that you want to keep there (i.e. you can't back it up to another drive temporarily) then grab Acronis Partition Manager and have the existing partition resized, and then add the second partition in.

 

it is new. my uncle said that sometimes drivers may be erased because my hdd is portable exeternal
sorry if i said wrong

 

No drivers to worry about. Just go into disk management and assign a drive letter.

 

I am saying that it is already formatted ton 360 gb in primary partition

 

Ah but does it have a drive letter?

 

yes it has a drive letter

 

go to disk management delete the partition
make a new partition size 160gigs & quick format
make a new partition of whats left prolly 140 gigs & quick format
windows automatically assigns drive letters to formatted harddrives