According to Tigerdirect.com, teh media is:
"TDK DVD-RAM94Y4 9.4GB Type IV DVD-RAM Disk In Removable Cartridge" (underscrore is mine). Have not been able to confirm if removeable means it can be taken out of the cartridge.
Hope this helps somewhat.
Foudn additional info at this site:
Type 4 - A case for a two-sided (Type 2S) 120 mm DVD-RAM disk such that the disk may be removed from the case. This case is reversible.
So I now assume that the disc is indeed removabkle from the case, and should work in the GSA-4163B.