While the majority of DEC's PDP-11 systems used UNIBUS or QBUS based peripherals for storage, some of the larger PDP-11s, along with larger machines such as the DECsystem 20 and the VAX-11/780 used MASSBUS for storage devices. As far as I can tell, the majority of these such as the RM02, RM03, and RM05 were all originally designed and manufactured by CDC. The RM05 specifically is based on the CDC 9766.
The information that I'm interested in is what range of disk packs were compatible with the RM05s? I've seen several notes that mention that RM05s should be able to take stock CDC 9766 packs instead of the DEC branded "RM05P" part. However I've also seen mentions of another compatible disk pack, the Nashua 4473. I can't find much information about this part aside from a few mentions, but assuming it was compatible this would suggest that there may have been some sort of standard and potentially other manufactures or other disk packs were compatible. Which disk packs (and their part numbers) were compatible with the DEC RM05 disk drive?