Thanks again Rharv. For my purposes I'm more than happy with the Ultra Plus Pak + Style PAKS 1,2,3 and 49 for now and think it unlikely I will make the jump to Audiophile so hopefully the 500GB will last me for quite some time.

If I keep the original PG ext USB drive intact I presume that any BIAB/RB updates or add on packs can be saved to both drives... one at a time so they retain the F: drive label when downloading (until the space on orig drive runs out of course)?

BIAB 2022 PLUSPAK (ext HD), 49PAKs, STYLESPAKs 1 - 6, Win 7 64bit PC, REAPER, Ozone, Adobe Audition CS6, EZ Drummer3 + EZ Keys,Soundcraft MTK22, Behringer X Touch Universal Controller,, SE Gemini/Rode NT2/Neumann/Shure mics