With the fsutil command in Windows 7 you can find the size of the master file table and get other information.
Open the command prompt in admin mode (just type cmd at start then press CTRL + SHIFT + ENTER). The command is
fsutil fsinfo ntfsinfo c:
. . . as you can see from this screen grab, you gets lot of information, including the bytes per sector and per cluster. Some of the values are given in hexadecimal. You can convert these values using the methods detailed in the tips for the past two nights, August 20 and August 21, 2017. The hexadecimal 5140000 for the 'Mft Valid Data Length' converts to a decimal value of 85196800. This is the number of bytes in Master File Table. There are 1,000,000 bytes in a full MB. So 85196800 comes to 85.2 MB.