Hard drive failing and xp running slow

Hi

I have 2 sata, one with os on, and 2 ide hard drives. The slave ide drive is failing i think.
Firstly my pc started to go slow as in the mouse would move every 10 seconds for about 3 and hard drive, network card pulse the same.

I have traced this to the slave ide as when i remove everything is good. I have run seagate diganostics on it from dos boot up and it displays errors which then are fixed. On re boot the drive is fine. You can view the data on it in explorer.

When you write to it it fails again but not everytime. Is this shafted beyond repair and should i back up everything of it and get rid. Its not under warranty.

What i don't quite get is when it fails and goes slow i cant shut down so have to restart and then the bios see's all drives as normal but never gets to the logon screen so doesn't boot. The only way i can boot is to remove the slave, boot up, restart with seagate dos disk and fix disk again which takes 3 hours.

Any help appreciated.

Also if i copy the data to another drive will this transfer corrupt data?