my company is scoping the possibility of enabling person accounts. I have been reading through documentation and different blogs to get a feel for pros and cons of doing this. One thing I found that I am not sure how to interpret - record sizes. If we are talking about converting existing Contact into Person Account, that means that a new Account record will be created, and it will be linked to the 'old' contact record with 1-1 relationship. So the Contact record stays, it will just be hidden from users. Now given relative sizes for records:
Contacts -- 2KB
Accounts -- 2KB
Person Accounts - 4KB
If for example we have 14 million Contact records it is roughly 24 gigs of storage. Now if we convert 3M of those into Person Accounts, does it mean that we will need 12 additional gigs of data storage(since 3M*4KB = 12 Gigs) or will it be just 6 Gigs (since we already have Contacts data in the system and we are just creating additional 3M Account records for those converted Contacts)?