partition not visible

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i am not able to view one of my partitions.total size of hdd is 660 gb(2 hdds) while total volume size visible in my computer is 613 gb
 
i guess. 660GB in memory is equable to 613GB in terms of Hard disk spacein hard disk take 1KB=1000B.... and so calculate like that
 
my maths calacultion in HDD 🙂614.6728992462158203125(divide the total of 660*1000*1000*1000 by 1024 each time instead of 1000)..
 
yeah. 1TB HDD is not really 1024GB. Much less.

https://imgur.com/7XJkt

this is what my 1TB HDD shows.


1Tb is equals to 1024GB. It shows much less because some of its memory used for hardware devices and its programming. Otherwise you can check its full memory at the time of booting.
 

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