RAID0 has no redundancy at all. If a drive fails, you lose ALL of your data if you can't get that drive working again. You can't "rebuild" a RAID0 array. Each drive has half of your data on it. So like if you stored the word typewriter, disk0 would have "typew" and disk1 would have "riter". If you lose disk1, you can't use disk0 to recover any data or put in a replacement drive and restore the array.
This also means that there are no valid readable partitions when you view a single drive in the operating system.
If the data wasn't damaged or corrupted at all, you can sometimes reinitialize an array using the RAID controller, but the RAID configuration data is stored on the drives themselves. Really no guarantee you can ever recover an array. That's why everyone with any sense strongly suggests a backup process if you use RAID0 for your main system.