Why there is a huge difference between a row size on a disk based table and a row size in memoptimized table of SQL 2014?

Hi All,
I have two table with similar structure and data, one is on disk and the other is in memory. I somehow calculated the difference between a row size of on disk and in memory table and found that the row size of in memory is 700 Bytes more than the disk based
tables.
aa

As others mentioned, memory optimized tables and disk based tables have different structures in SQL Server 2014.
For memory optimized tables, the number of indexes on table also contribute to the size. You can calculate the exact size of rows and thus the table size using the formula given in the below articles
Table and Row Size in Memory-Optimized Tables
Estimate the Size of a Table
Krishnakumar S

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