I have 256MB in Disk0, 128MB in Disk1, 64MB in bootflash, and 64MB in sup-bootflash to give a total of 512MB.>
You cannot combine all these different flash cards together and make one. You need to have 512 on your disk0 or disk1.
If you are running a modular code the size is about 146Mb, and for none-modular, it is about 116Mb. You could give it try and loaded it in your disck0, but the recommendations as you noted is to have 512.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...