Hidden, hidden memory on SSD

dmarshall29 · 13 May 2011 at 19:07

I have a Vertex 2 120gb which I use mainly just for my OS but also for a handful of games so I have to make sure that I don't use too much. Recently I checked to see what my ssd contained using a program called jdiskreport and this is what it found:

The report included the page file and Hiberfil. The test reports says that I have used up 41.9gb, yet however when I check properties on the C drive in windows explorer it says 44gb used leaving me 67.6gb left free. I have used other programs aside from jdiskreport but they all report about 42gb used.

So just out of curiosity I was wondering what this hidden 2gb actually was and if it would expand?

Gazanimal · 13 May 2011 at 19:14

Doesn't Windows report GB's differently to some other programs?

E.g. 1024mb = 1Gb or 1000mb = 1Gb

Maybe that's where the difference is?

dmarshall29 · 13 May 2011 at 19:25

Possibly, I just deleted all my system restores which added up to like 5gb+ so now windows is reporting 38.2gb used and jdisk is reporting the same 41.9gb :S lol so its gone the opposite way now. Does windows explorer count the page file as used memory?

SparkyG · 13 May 2011 at 19:37

does win 7 make a system partition?

dmarshall29 · 13 May 2011 at 19:40

It has a system reserve of 100mb

Gazanimal · 13 May 2011 at 22:46

Taken from the OCZ website:

Consumers may see a discrepancy between reported capacity and actual capacity; the storage industry standard is to display capacity in decimal. However, the operating system usually calculates capacity in binary format, causing traditional HDD and SSD to show a lower capacity in Windows. In the case of SSDs, some of the capacity is reserved for formatting and redundancy for wear leveling

Probably explains the discrepancy

dmarshall29 · 13 May 2011 at 23:34

Well that would explain a lot lol

Amraam · 14 May 2011 at 00:19

Gazanimal said:
Doesn't Windows report GB's differently to some other programs?

E.g. 1024mb = 1Gb or 1000mb = 1Gb

Maybe that's where the difference is?

That's why 320GB HDD actually formats to ~298GB.

dmarshall29 · 14 May 2011 at 00:45

Gazanimal said:
Taken from the OCZ website:

Probably explains the discrepancy

O wait you mean what every other manufacture does to make it seem like you are getting more memory. by rounding down 1024 to 1000. I know that im allready taking in to account that I have 111.6gb space not 120gb.

robgmun · 14 May 2011 at 08:36

dmarshall29 said:
O wait you mean what every other manufacture does to make it seem like you are getting more memory. by rounding down 1024 to 1000. I know that im allready taking in to account that I have 111.6gb space not 120gb.

To be frank it's been a long time coming that all this should be changed. They really should sell HD on formatted space.

KelDG · 14 May 2011 at 13:33

Is there not also some spare space for wear leveling, and some spare chunks if small parts fail?

Rroff · 14 May 2011 at 13:39

JDiskReport seems to be rounding the figures as well... thats awful convenient that Windows is exactly 16.0gig and files in this directory exactly 7.0gig.