2

I have recently installed a OCZ Vertex Plus R2 VTXPLR2-25SAT2-120GB 2.5 120GB SATA II MLC Internal Solid State Drive (SSD) 120 GB SSD. I figured I would have about 110 to 112 GB knowing that hdd/ssd and other mass storage device manufactures use the 1000x1000x1000 vs OS using the math of 1024x1024x1024 to calc a gig. then take into account the format overhead and so on.

So am I just lucky that my SSD is showing 115 GB?enter image description here shown as drive J:. is my math wrong in that if I divide 120,000,000,000 by 1024/1024/1024 that it should be 111.76 GB?

I should note that windows 7 is on it and NTFS formatted.

I am not complaining about the "extra gigs" I am just wanting to understand the variance in what I expected to what I got. Any answers?

Edit: I updated the drive info OCZ Vertex Plus R2 VTXPLR2-25SAT2-120GB 2.5" 120GB SATA II MLC Internal Solid State Drive (SSD)

1
  • If you right-click and select Properties on the drive letter (ie the partition) Windows will show you the capacity in bytes, removing all ambiguity. What does that tell you? Sep 24, 2018 at 21:44

1 Answer 1

3

It is more the case that you got unlucky. OCZ isn't using the SI prefixes for their drives, so a 120GB drive should show up as 120GB in windows (I think it formatted is more like 119.7 or some such). The SandForce drive has a technology called RAISE, which is a bit like RAID5 but across NAND dies. This mean one die worth of storage is lost to parity data. When OCZ then moved from 32nm to 25nm NAND the die size doubled and thus the amount of storage lost to parity data doubled as well. So you are really getting 4GBs less than promised. The loss of dies also means the drive is a bit slower. On the other hand the $/GB of 25nm NAND is much less than 34nm NAND.

4
  • I updated the drive info as I was a little off and it may be important. The drive uses an Indilinx controler and is OCZ Vertex Plus R2.
    – Carl B
    Sep 5, 2012 at 13:59
  • 1
    @CarlB - This answer is still valid.
    – Ramhound
    Sep 5, 2012 at 14:31
  • Well this has dashed what I thought was good fortune :(
    – Carl B
    Sep 6, 2012 at 1:28
  • 1
    "OCZ isn't using the SI prefixes for their drives," That's not what they say on the spec pages on their web site. They say: "Definition of capacity: Toshiba defines a megabyte (MB) as 1,000,000 bytes, a gigabyte (GB) as 1,000,000,000 bytes and a terabyte (TB) as 1,000,000,000,000 bytes. " (see e.g. ssd.toshiba-memory.com/en-amer/ssd ) As the OP states, 120 decimal GB (which is what OCZ says they use) should indeed be displayed by Windows as 111.76 GB for the entire drive. Sep 24, 2018 at 21:40

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .