From the readme:
"All you need to get the Iomega Jaz 1GB drive working under AmigaOS 3.9!
It includes Glow Icons and DOS Drivers for Amiga FFS, PC, Mac and PFS2/3 format Disks.
These were left out from OS 3.9! The Iomega Tools in 3.9 works with Jaz Disks by the way."This archive is available at your
local AmiNet mirror as
/disk/misc/JazOS3.9.lha.
