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Up to 04/2010 the CIC MID had an 8GB flash drive and from 04/2010 the CIC MID had a 16GB flash drive with no limitations.

On the small 8GB flash drive you can install every EAST version - even the newest 2021 (5,13GB) and the 2018-1 WEST version (5,58GB).

---------- WEST ---------- EAST
2018-1 -- 5,58GB -------- 5,08GB
2018-2 -- 7,27GB -------- 5,93GB
2019-1 -- 7,34GB -------- 6,53GB
2019-2 -- 7,41GB -------- 6,67GB
2020 -- 6,72GB -------- 4,93GB
2021 -- 6,86GB -------- 5,13GB

Green - validated fits
Red - validated does not fit

As you can see in the table, the limit is exactly between 6.67GB (fits) and 6.72GB (no longer fits)

Best Regards
NAVJunk

This is good info with the extracted sizes of the maps etc but I'm sure it's 03-2010 as the 8GB -> 16GB swap date, I know someone with a build date of 02-03-2010 who loaded Motion West 2021 with no issues and sure they never had a replacement unit since factory.