Question about Western Digital Wd Elements Se 1tb Portable Black Wdbabv0010 USB 20 Hard Drive

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Hi, I have WD 1TB Elements SE. When I checked the usage space on the partition after I plug in the drive, it shows a total capacity as 1,000,200,990,720 bytes (931 GB) and it shows 921,753,505,792 bytes (858 GB) as Used space and 78,447,484,928 bytes (73.0) GB as Free space. Now when I go inside and select all files and folders and right click and check the size of all the selected files it says 590 GB (634,219,110,123 bytes). Can you explain this discrepancy please. I can't understand how it filled upto 858 GB when all the files on the drive total upto only 590 GB. And please don't ask me to format it, I am having it as the last option since I don't have another drive as big as this for a back up and my internal drives are also almost full. Thank you.

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  • DJ Skywalker
    DJ Skywalker Jun 24, 2011

    Do you have any OS on your external HDD ?

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If you have a 32bit system, it is expected to have miscalculations, a 32 bits can only go up to 4Gb for calculations (that is, 2^32 = 4'294'967'296 bytes) a 64bit system can make calculations to 2^64 bytes this is also why you couldn't copy a file larger than 4Gb in a 32bit operating system...
So, if you are running a 32bit OS, you should expect a discrepancy for the total space of the Hard Drive and the amount it shows (that's the 93Gb you are missing as total capacity).
Another reason why it can show you incorrect calculations are damaged sectors on the hard drive it-self. These will present themselves either as occupied memory or missing memory.
So, you should expect some miss calculations and you can expect some damaged sectors on the hard disk (a external drive spins on and off too often, eventually damaging sectors... its a problem of physical drives).
In the end, your disk might be fragmented, so run a disk analysis and a defragmentation on the disk so it can recalculate.
A note: A disk is like a shelve, you put things where there is space, if you remove things, that space will be open, and if you want to put something there it has to be the exact size or small enough to fit there. This effect, when things are small enough leaves blank spaces unusable, consuming space on the hard drive and making the access of files slower, this is fragmentation. In order to expand your disk life expectancy you should run defragmentations...
To run a defragmentation, go to START, write "Disk Defragmenter", choose your disk and run and analysis and defragmentation.

Posted on Jun 24, 2011

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Low capacity problem


Hi,

Mostly this is affected by match used to construct the drive geometry. The narrative below is courtesy Tiger Direct of Canada and is their copyrighted content.

When we ask our customers if an Answer is satisfactory, the requested rating is four diamonds for a thorough answer. Hopefully, you will find the below content achieves that mark.
  1. The way size is calculated and displayed.
  2. Any "Partitions" on the disk will change the total in a specific partition.
  3. Hidden files and folders decrease available space.
  4. Compression increases the apparent size, but not the physical size.
  5. Drives larger than the OS or Drivers natively supports.
hddsizescreen.jpgFirst, the definition of a megabytes (or gigabytes) is a unit of data storage capacity measured in 1,048,576 bytes (or 1024KB). The larger the numbers, the more apparent the size difference will be when listing the size as megabytes (or gigabytes) versus bytes. Actually, both numbers are correct. The noticeable difference is due to the 1024KB definition of a megabyte. This is why a 95.3GB hard drive can also be listed as having 102 billion bytes of total space. Just think of it as "round off" In the screen shot at right: The first number is the total number of bytes, the second number is based on the number of megabytes or gigabytes.
Second, some computers have a non-DOS hard drive partition that is used for features such as Save to Disk, Hibernation, or Recovery. This partition is not normally reported by the operating system, although it can be viewed using a disk partition utility. This is very common on desktops and laptops. NOTE: Partition information will be created or formatted automatically during initial system setup and a system recovery.
Third, by default, all system files are hidden and cannot be seen. This may adversely affect the reporting of available hard drive space. You can set your Folder Options so you view system and hidden files and folders, but do be careful as changes to system files can adversely affect your system.
Fourth, if you turn on Compression for a drive, it will increase reported free space and used space, but since compression is based upon the actual contents, this number is not fixed, but will change as files are added or changed.
Fifth, older operating systems did not support some of today's larger drives, so the total space reported may be much smaller than the drive specifications.
It is also worth noting that bad sectors are corrected by your operating system and can change the total drive space, free space, or used space as well.
So as long as a drive is reporting a value approximately close to the specification value, you can be comfortable that you received the right drive and that you are getting to correct data storage. Of course, tuning of your drive's partitions and options can yield optimal values, but this is not something for the average user to explore.



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