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I'd stay away from hardware RAID controllers. If they fail you're gonna have a hard time. Learned that the hard way. With a software RAID you can do what you proposed. Just put the disk in another system and use it there.
Seconded. Software RAID is much easier to recover from.
I'm going to give you the benefit of the doubt and assume what you said was simply confusing, but not wrong.
So just to be clear if your raid array fails, and you're using software raid, you can plug all of the disks into a new machine and use it there. But you can't just take a single disk out of a raid 5 array, for example, and plug it in and use it as a normal USB hard drive that just had some of the files on it, or something. Even if you built the array using soft-raid.
No, they mean that if the controller fails, you have to get a compatible controller, not just any controller. And that usually means getting another of the exact same controller. Hopefully they're still available to buy somewhere. And hopefully it's got a matching firmware version.
But if you're using mdraid? Yeah just slap those drives on any disk controller and bring it up in the OS, no problem.
You technically can with software raid
Not to mention you can get important features like checksums and data validation.