Just a Bunch of Disks or Just a Bunch of Drives.
This is a RAID term that basically means drive spanning. One large virtual drive is creates from two or more physical drives. A user may create a large 1TB virtual drive out of several smaller hard drives…
2 x 500GB drives
1 x 500GB drive + 2 x 250GB drives
10 x 100GB drives
…or any other combination. Data is written to one drive until it runs out of space, and then data is written to the next drive.
There is no redundancy in a JBOD array, so if one drive fails then you may lose all of your data on the array, or just the data on that drive, depending on the quality of your RAID controller.