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Computing HDD/SSD Capacity after a format

Last response: in Storage
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June 28, 2012 4:11:14 PM

I'm trying to figure out how to compute the formatted capacity of a HDD/SSD (Windows/NTFS). I am not asking why does Windows say my HDD/SSD capacity is X when the manufacturer says it's Y, I know that answer.

The reason I am asking is that I am going to move my OS from a 3x HDD RAID0 to a single SSD. I want to avoid having to RAID two SSDs because of the lack of TRIM support and the fact that RAID anything just adds a layer of unnecessary grief and complication. While many recommended SSDs are in the 256GB range, that size may not meet my space requirements.

Given the prices of SSDs, you can see why this is important.

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a c 542 G Storage
June 28, 2012 4:25:00 PM

HDD & SSD drive manufacturers calculate 1 Gigabyte as 1,000,000,000 bytes.
Microsoft and memory RAM manufacturers calculate 1 Gigabyte as 1,073,741,824 bytes.

The difference between the 2 methods is 7%.

So subtract 7% from any HDD or SSD and that is your formatted capacity.
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June 28, 2012 4:38:10 PM

Dereck47 said:
HDD & SSD drive manufacturers calculate 1 Gigabyte as 1,000,000,000 bytes.
Microsoft and memory RAM manufacturers calculate 1 Gigabyte as 1,073,741,824 bytes.

The difference between the 2 methods is 7%.

So subtract 7% from any HDD or SSD and that is your formatted capacity.


Thanks, Dereck, that was EXACTLY what I was looking for!
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June 28, 2012 4:38:28 PM

Best answer selected by NewbieTechGodII.
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