(There's no video for SuperDoubler Pro 1.1 yet. Please contribute to MR and add a video now!)
SuperDoubler was a bundle Symantec created to repackage DiskDoubler v4.1, AutoDoubler v2.0.4 and CopyDoubler v2.0.4.
superdoublertm_pro_1.1.sit (860.37 KiB / 881.02 KB)
SuperDoubler Pro v1.1 / compressed w/ Stuffit
Emulating this? It should run fine under: Basilisk II