External partition hardisk

My external hardisk was 160gb.it was not used on a pc but another computerised mc,window xp.it was formatted to 3 parts and when combined showed capacity 50 gb used of 90 gb.now i'm using it on my computer win7.i format it even to NTSC but the capacity remain 90 gb.I WANT IT BACK TO 160 GB AND NO PARTITION,WHAT I DO?PLEASE HELP..
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More about external partition hardisk
  1. Right-click COMPUTER in start menu, select manage.

    Choose disk manager, select the external, delete partitions and the create a new single partitions.

    Be careful you don;t zap your Windows disk.
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