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You will need the following ingredients:

- Promise FastTrak 4310 SATA RAID controller with latest BIOS (2.8.1.0004) and drivers (2.6.1.318)
- four Hitachi HDS721010KLA330 1TB SATA drives
- 2TB of really important data

1. install the Promise controller in PCI slot
2. boot to OS and create RAID5 array on all 4 drives
3. start transferring files to the newly created array
4. fill up 2 terabytes and enjoy the error message
5. spend two days trying to recover the files
6. spend another two days trying to recover yourself

This recipe is OS independent.