Backup job is creating multiple BKF files

Hello 

 

I am using BE2012 and trying to backup servers to disk storage creted on NAS box. My backups are successfull and restore is also successfull. One thing I have noticed that even if my B2D folder properties says to create 100gb single BKF file, my backups are creating multiple B2D files (not 100gb in size) and the backup size is around 109GB so it should maximum 2files but it is creating more. Here is a example below.

 

I have selected d:\drive from a server. and under job log it says it used

 

All Media Used

 

 B2D002834

 B2D002835

 B2D002837

 B2D002840

 B2D002842

 B2D002846

 B2D002849

 B2D002851

 B2D002853

 

Backed up 276277 files in 10542 directories.

Processed 116633063180 bytes in  9 hours,  2 minutes, and  9 seconds.

Throughput rate: 205 MB/min

Compression Type: None

 

I am attaching few screenshots to give some clarity,

 

I am expecting that this should create a single 100gb file.