What does Workbench.library do?

[Boing-ball]

I am going to be installing a new SCSI HD on a dead Amiga
using A4000T installation floppy disks (if the capacitors haven't leaked).

I recall when doing this years ago that there's a slight difference between the
A4000T install disk package and other Amigas: if you use the former on an
Amiga other than an A4000T you'll get a blank screen when you boot up
because of a missing file. Is it the Workbench.library file?

On the 4000T ROMs I believe the space was made because of the 2 driver controllers for SCSI and IDE. So Workbench.library and  possibly icon.library will be needed in Libs.

[Boing-ball]

Amiga A4000D only has built in IDE. So only uses scsi.device, which is standard on all Amiga systems (Except A4000T).