I have a formatted 3tb Buffalo HDD but it is only showing 2.4tb of space so I have lost 600gb, I also have other HDD's that are showing 30-40gb less than they should, how can I recover the lost space please??

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wow, 600 is a LOT.

where are you looking at this, this PC or disk management?

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32 bit vs 64 bit OS

Drives that are 512KB sectors max out at 2TB but 4K format drives can actually be larger even though they show only 512 kb size sectors but they really are 1024kb in size and the drive internally adjusts for that, using all of it. There are also over 2TB hard drives, but they need 64 bit systems to access their full potential that are not 4K Advanced Format and usually the system is used to create sector sizes between 1024 and 4096kb.

So, it's a bit difficult to know what your exact problem is caused by since we don't know the exact drive nor the exact operating system used to access it, nor the software used to format it.
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the other drives
" I also have other HDD's that are showing 30-40gb less than they should, how can I recover the lost space please??"

A manufacturer considers 1 Megabyte to be 1000 Kilobytes, 1 Gigabyte to be 1000 Megabytes, 1 Terabyte to be 1000 Gigabytes and so on. This is correct considering that kilo means 1000 and mega means 1000000 (10^6). However, computers calculate on base 2 and to them, 1 MB is actually 1024 kilobytes, 1GB is 1024MB and 1 TB is 1024GB. This difference in the method of computation is responsible for this "missing space."

Lets take an example of a 500 GB hard disk.

"From a manufacturer's point of view, the 500GB will have 500*1000*1000*1000 = 500000000000 bytes.

From a computer's point of view, 500GB is actually 500*1024*1024*1024 = 536870912000 bytes.

So, a hard drive that promises to have 500 GB storage space will actually display 465.66GB, 536870912000-500000000000 = 36870912000 bytes (34.34GB) less storage space when connected to a computer."

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