7200.12 / F3 for desktop RAID 5, or do I need TLER / ERC?

Samsung f3 and 7200.12 is basically the same

Thanks. This I get, but it does not answer my question.

Are those ok for an intel RAID? They do not have an error correction time limitation.

How come the 7200.12 listed as recommended?

"The only goal is data reliability / longevity"

Is that is true, then why do you consider RAID at all? You should be concentrating on backups if you care about your data. If you care about uptime, then RAID1 or RAID0+1/1+0 is your best bet, but RAID can never replace a backup.

Onboard RAID5 is likely less reliable than a single disk.

But is it less reliable than 4 disks?
If I have 4 disks, any one of them can fail. Instead of backing them up individually (which requires 4 backup disks) I figured 1 disk for parity, and I'm done.
Am I wrong?

No, you're right.

The problem is that the RAID5 scheme requires a much more complex design, and many closed-source drivers offer poor support, meaning potential filesystem corruption and low performance. The Intel RAID drivers are actually pretty decent, so RAID5 is still an option assuming you have at least a backup of your most valuable files somewhere else.

Consider your RAID5 as safe as a single disk that can fail. Forget the disk failures - its the havoc after a minor or major disk failure that may destroy your data. For example, after your Windows suddenly froze and you hit reset-button, you see that the RAID array is split into two arrays, and both are unusable. In some cases, the user panics and starts trying things in the RAID BIOS setup like re-creating RAID or deleting the RAID or whatever. This is so dangerous especially with RAID5 because one bad setting and it destroys your data in the process when the parity rebuild starts.

So in short, the RAID drivers may have issues or rough edges causing user error to permanently destroy data that was just temporarily inaccessible. Therefore, the RAID-layer itself is an additional point of failure within your storage-setup. So, using RAID5 both adds risk of failure and reduces risk of failure.

Complicated world, isn't it?  

That's why i say: focus on a backup. It's worth so much more than RAID alone.

WOW. Thanks so much for the eye opening response.
OK. I get it. RAID was probably the wrong way. I guess after playing with SCSI RAIDs at work years ago I was too eager to setup one at home.