Our Seagate 500gb drive has broken and I have temporarily replaced it with an 80 GB drive just to confirm the HDD failure but this capacity will not allow us to record etc. I want to buy a replacement drive today rather than wait for one to be posted off Amazon etc. However local suppliers such PC world and curry's do not stock Seagate hard drives and on the net there are quite a few people saying they have struggled with compatibility of drives. My question does the brand of the drive really matter and what capacity can I go up to as 500gb drives are few and far between and the low costs of drives makes me want to go bigger. Anyone with advice or experience they can share would be appreciated!