Originally Posted by metropole
What are the options to bundle several hard drives to one logical drive letter?
Is spanning the right option?
You've got several choices, assuming how many "several" is and whether you want protection against drive failures.
RAID-0 (like spanning) is a way to combine all the drives into one drive. Beware that one drive failure will cause you to lose all your data, so backup often.
RAID-10 combines drives into mirrored pairs and then stripes the drives. Two drives are called RAID-1; four or more are called RAID-10. One drive in each mirrored pair can fail without losing data.
RAID-5 combines drives into striped array with parity - similar to RAID-5 - but one drive can fail without losing data. You need a minimum of three drives for RAID-5.
Next you need to pick whether you want software RAID or hardware RAID. Software RAID is only bootable with RAID-10. You'll need a separate boot drive for RAID-10. Hardware RAID boots all RAID levels. Also, hardware RAID typically has a write-back cache that improves performance, but only use the cache if the card also has a battery backing up the memory.
That's more information than you needed, but I'd be happy to help if you have questions.