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Windows 7: Show us your SSD performance

19 Dec 2011   #2411
ignatzatsonic

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit
 
 

A 1 TB drive has only 931 MB usable.

That's very close to 7%.

The usable capacity of an 80 GB Intel SSD is 74.5 GB.

That is also very close to 7%.

The question is:

What is the source of the differential in the case of Intel SSDs--overprovisioning or the well-known decimal/binary reason as on 1 TB/931 MB drives?


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19 Dec 2011   #2412
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

Quote:
Aha!!!

So, by inference, an 80 GB Intel SSD is actually 88 GB?

The 7% decimal/binary differential does not apply, at least to Intel SSDs?
I think it is the other way around. An 80GB (decimal) disk shows as 74.5GB (binary) on the screen. There you have your 7% difference.
Quote:
If I knew what you were talking about here then I could answer maybe.???
I am talking about the decimal to binary effect. Each decimal capacity number on the box or in ads will show 7% less (in the GB range) when you see it in the system - because all nums in the system are in binary.
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19 Dec 2011   #2413
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

Total confusion reigns - LOL

Divide 100 billion (100GB in decimal) three times by 1024 and see what you get.

The first one to figure it out wins the Speedy Gonzales prize.
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19 Dec 2011   #2414
essenbe

Windows 10 Pro/ Windows 10 Pro Insider
 
 

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19 Dec 2011   #2415
essenbe

Windows 10 Pro/ Windows 10 Pro Insider
 
 

The difference being referred to is the reason a 1TB hard drive gives 931GB of useable space. But, AFAIK, all SSD manufacturers over provision SSDs for maintenance and nand replacement.
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19 Dec 2011   #2416
ignatzatsonic

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit
 
 

Quote   Quote: Originally Posted by whs View Post
Total confusion reigns - LOL

Divide 100 billion (100GB in decimal) three times by 1024 and see what you get.

The first one to figure it out wins the Speedy Gonzales prize.
Well, I get 9.5367431.

My handy-dandy calculator won't accept 100,000,000,000.

So I used 10,000,000 and divided 3 times by .1024 instead.

Numerator and denominator both pre-divided by 10,000--to fit my calculator.

Not sure what it means!!!
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19 Dec 2011   #2417
essenbe

Windows 10 Pro/ Windows 10 Pro Insider
 
 

I get 74.505
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19 Dec 2011   #2418
Hopalong X

Windows7 Pro 64bit SP-1; Windows XP Pro 32bit
 
 

If you look at the bottom right NAND chip it is a different part number. Still can't find my list as usual.
So it isn't a straight 10x ? =80GB

One chip is used with the controller only for wear leveling and "Raid type parity".
Quotes are what Intel calls it I'm pretty sure.
So that takes one and the other 9 are storage.

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19 Dec 2011   #2419
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

Quote:
Well, I get 9.5367431.
You got close. Shift the comma one position to the right since you started with 10 billion and not 100 billion.
Quote:
I get 74.505
You better put new batteries into your calculator. LOL
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19 Dec 2011   #2420
Hopalong X

Windows7 Pro 64bit SP-1; Windows XP Pro 32bit
 
 

Quote:
Intel sent a 300GB version of the 320 for us to take a look at. Internally the drive has 20 physical NAND devices. Each NAND device is 16GB in size and features two 64Gbit 25nm 2-bit MLC NAND die. That works out to be 320GB of NAND for a drive whose rated capacity is 300GB. In Windows you'll see ~279GB of free space, which leaves 12.8% of the total NAND capacity as spare area
Anandtech quote for 300GB. > AnandTech - The Intel SSD 320 Review: 25nm G3 is Finally Here

The I-29F16 is 16GB. New numbering system.
The I-29F64 is 8GB. Old number system exact same chip as X-25.

So one 16GB + 8x8GB = 80GB storage.
1 8GB is used with the controller as explained in my above post.

I had to figure it out from scratch since I couldn't find my list.

The difference is over provisioning. This isn't an HDD.
Read the anandtech page I posted above explaining the OP.
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