The size of a record in the MFT 1 K (according to Microsoft site). 
   Some other sources indicate 2K may be possible.
  
 NTFS stores the data contents or "attributes" of each record 
   Resident in an MFT entry, up to 900 bytes
     Primary filename (required)

     Basic attributes (ms-dos r,h,s,a) (required)

     Allocation map of non-resident portion (required)

     Permissions (used with/by access control list)

     Other attributes if they can fit.
       Could include the file's contents if small enough.

   And if needed, non-resident attributes.
     Information that didn't fit in mft record.

     Mainly, file's data.

     Additional attributes (those not required in record, and that didn't fit)

     If file is encrypted, sparse file, or compressed, its "data" contents
       will always be non-resident.

     If the allocation map it too large (file large or highly fragmented)
       NTFS uses tiered pointer (similar to Unix) to provide resident
       allocation entries that point to additional non-resident allocation
        pointers.

 Access control list.
   Like file attributes on steroids.

   Use cacls to view/modify file's access control list.