Please report all spam threads, posts and suspicious members. We receive spam notifications and will take immediate action!
Results 1 to 2 of 2

Thread: Why SSD acual capacity is different with Disk capacity?




  1. #1
    Join Date
    May 2011
    Location
    UK
    Posts
    12

    Default Why SSD acual capacity is different with Disk capacity?

    Many users are very confused that why real capacity is different with capacity they ordered. I collected some information and share with yours.

    The disk capacity doesn't match with the actual capacity caused by the different algorithms of OS and Hard Disk.
    Hard Disk manufacture caculated by 1000Byte=1KB,1000KB=1MB,1000MB=1GB:
    But operation system caculated by 1024Byte=1KB, 1024KB=1MB, 1024MB=1GB.
    So, the relationship between disk capacity and OS acual capcity should be :1000*1000*1000/1024/1024/1024=0.93132257461547815625

    Let's take 256GB Nand flash as example, So,256GB*0.931322=238.4GB.

  2. #2
    profJim's Avatar
    profJim is online now Chief Munchkin + moderator
    Join Date
    Dec 2008
    Location
    Tacoma, WA. [USA]
    Posts
    7,811

    Default Re: Why SSD acual capacity is different with Disk capacity?

    To put it another way:
    1024 x 1024 x 1024 =1,073,441,824
    This means that the disk manufacturer's published disk size is about 7.34 % higher than the o/s reported disk size.
    This applies to HDDs and SSDs.
    In the example in post #1, the reported disk size is 93.8% of the OEM reported disk size.
    With many/most solid state drives, some disk capacity is held in reserve for “over provisioning”. A web search using over provisioning ssd will explain this feature.

    Check out Solid-state drive - Wikipedia for more information.
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •