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Why are some SSD's 60GB and other's 64GB?

Last response: in Storage
January 26, 2012 7:45:05 PM

Wouldn't they all have the same internal chips ???

usually memory increases by the power of 2. 2,4,8,16,32,64 right?

What is up with 60GB like the vertex ?

More about : ssd 60gb 64gb

a b } Memory
a c 311 G Storage
January 26, 2012 8:01:38 PM

I'm thinking that it is just different levels of overprovisioning. Some ssd management software, Samsung Magician for example allow you to change the default level and reclaim some space.
a b G Storage
January 26, 2012 8:48:42 PM

They are manufactured with individual memory chips, so they can use 8 chips to get one capacity, or 9 chips, or whatever. Plus the devices contain more memory that the user is allowed to access. The firmware of the device resides somewhere, as well as the extra space that the device uses for its own housekeeping and so forth.

RAM chips have probably stayed with the "power of 2" thing more because of how we looked at memory and what the users expected to see more than because of any limitation in how they are designed and manufactured. Hard drives have always been a little more loose with how they specified capacities. Look at all of the different SSD sizes available on newegg- there are even more odd numbers such as 90GB and 115GB and so forth. They go from 30GB up to 256GB in barely 10-20GB increments.
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January 26, 2012 9:05:49 PM

ok- that starting to make sense.

So internally they are the same- but the result you see is different based on how the mfg set them up.

Does it have to do with the controller chip?
Like sandforce vs Marvel ?

I noticed sandforce usually is 60GB and marvel based ssd's are 64GB
a c 256 G Storage
January 27, 2012 1:18:33 AM

It is a matter of advertising. When you see an ssd advertised as a 64GB ssd it refers to the total raw capacity. The total raw capacity is not the same as the available capacity. The actual available capacity will be less for a variety of technical reasons. This led to complaints from users.

In response, some manufacturers and vendors started rounding down and advertising their ssd's as 60GB. That may or may not be the actual available capacity. It can still vary for a variety of reasons. The variable that is mentioned most often is over provisioning. The percentage of space that is reserved for over provisioning can vary quite a bit.

For all practical purposes a 60GB and a 64GB ssd have the same total raw capacity while the actual available space will vary.
a c 226 } Memory
a c 260 G Storage
January 27, 2012 1:32:59 AM

Many manufacturers specify their 64,000,000,000byte drives as 64GB. Computers work on 2^10=1024 so 64,000,000,000/(3x1024)=59.6GB!
a c 256 G Storage
January 27, 2012 1:49:32 AM

^5 +1 what rolli59 said :D 

That is one of the many reasons specifications are confusing! :pfff: 

January 27, 2012 12:38:53 PM

rolli59 said:
Many manufacturers specify their 64,000,000,000byte drives as 64GB. Computers work on 2^10=1024 so 64,000,000,000/(3x1024)=59.6GB!

This sort of makes sense. So both are right I guess