How to Find out the Size of a Hard Drive

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You can find out the overall (storage) size of your hard drive and its current used and remaining memory on any Mac, PC, or phone by viewing your storage information. This is useful for figuring out how much space you have available for use before installing large programs or files. You may also want to measure the physical dimensions of a PC's hard drive by removing it--knowing its length, width, and height will help you pick a compatible replacement if you ever need to install a new drive. Make sure you understand how to accurately measure your hard drive!

Measuring Hard Drive Size

To find the physical size of a hard drive (3.5"/2.5"), you'll need to open the computer and measure it. To see your total hard drive space (GB/TB), right-click the Windows menu, select File Explorer , right-click the drive, and click Properties .

Method 1
Method 1 of 4:

Determining your Hard Drive's Physical Size

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    You should only need to measure your current hard drive if you plan on upgrading it, in which case you'll need to know the exact dimensions of your hard drive to ensure a proper fit.
    • Removing or upgrading the hard drive on a Mac without professional help is not recommended.
  2. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/7\/72\/Find-out-the-Size-of-a-Hard-Drive-Step-15-Version-2.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-15-Version-2.jpg","bigUrl":"\/images\/thumb\/7\/72\/Find-out-the-Size-of-a-Hard-Drive-Step-15-Version-2.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-15-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"}
    If you aren't careful while handling your hard drive, you can damage your files. Backing up your computer ensures that your files will be safe even if you accidentally harm your hard drive.
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    For a desktop, you should also unplug your Central Processing Unit (CPU).
  4. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/b\/bc\/Find-out-the-Size-of-a-Hard-Drive-Step-17.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-17.jpg","bigUrl":"\/images\/thumb\/b\/bc\/Find-out-the-Size-of-a-Hard-Drive-Step-17.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-17.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"}
    If you don't, you can get shocked. [1]
    • Most laptops have a quick-release button on the casing's underside that removes the battery, although some models require you to unscrew the casing.
    • Mac batteries are extremely difficult to remove, which is another reason PCs are better-suited to this method.
  5. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/c\/ca\/Find-out-the-Size-of-a-Hard-Drive-Step-18.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-18.jpg","bigUrl":"\/images\/thumb\/c\/ca\/Find-out-the-Size-of-a-Hard-Drive-Step-18.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-18.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"}
    If you have a laptop, this will be on the underside of the computer. For a desktop, you need to open the side of the CPU.
    • You may need a screwdriver to open your casing.
    • If you aren't comfortable opening your computer's casing, take your computer to a tech department (e.g., Best Buy) and have them open the casing for you.
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    Depending on your computer make and model, you may have to unscrew a bracket around your hard drive before removing it.
  7. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/e\/e5\/Find-out-the-Size-of-a-Hard-Drive-Step-20.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-20.jpg","bigUrl":"\/images\/thumb\/e\/e5\/Find-out-the-Size-of-a-Hard-Drive-Step-20.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-20.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"}
    There will be a ribbon attaching your hard drive to your computer--leave this attached. You should be able to measure the hard drive without disconnecting it from your computer.
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    Your hard drive is fragile. Use a pillow or towel to support it.
  9. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/d\/d8\/Find-out-the-Size-of-a-Hard-Drive-Step-22.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-22.jpg","bigUrl":"\/images\/thumb\/d\/d8\/Find-out-the-Size-of-a-Hard-Drive-Step-22.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-22.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"}
    This will both tell you the exact dimensions of your hard drive and determine your hard drive's classification. You should measure length, width, and height.
    • For maximum accuracy, record your drive's dimensions in millimeters.
    • Pay close attention to your hard drive's height. This value dictates which types of hard drive will fit into your casing should you decide to install a new hard drive.
  10. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/e\/e9\/Find-out-the-Size-of-a-Hard-Drive-Step-23.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-23.jpg","bigUrl":"\/images\/thumb\/e\/e9\/Find-out-the-Size-of-a-Hard-Drive-Step-23.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-23.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"}
    Hard drives come in two main sizes--"3.5 inch", and "2.5 inch"--which are technical classifications that refer to the width of a hard drive's platter (the disk that stores your computer's memory), but not the full dimensions of the hard drive unit itself. Your hard drive's actual dimensions will determine its classification.
    • 3.5 inch drives are 146 mm long, 101.6 mm wide, and either 19 or 25.4 mm tall.
    • 2.5 inch drives are 100 mm long, 69.85 mm wide, and either 5, 7, 9.5 (the most common), 12.5, 15, or 19 mm tall. [2]
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    If you ever need to install a new hard drive, this information will help you accurately pick one.
  12. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/1\/11\/Find-out-the-Size-of-a-Hard-Drive-Step-25.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-25.jpg","bigUrl":"\/images\/thumb\/1\/11\/Find-out-the-Size-of-a-Hard-Drive-Step-25.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-25.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"}
    Now you know the size of your hard drive!
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Method 2
Method 2 of 4:

Windows

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  1. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/e\/e3\/Find-out-the-Size-of-a-Hard-Drive-Step-6-Version-2.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-6-Version-2.jpg","bigUrl":"\/images\/thumb\/e\/e3\/Find-out-the-Size-of-a-Hard-Drive-Step-6-Version-2.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-6-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    You should see two distinct sections when it opens: "Folders" and "Devices and Drives".
  2. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/a\/ae\/Find-out-the-Size-of-a-Hard-Drive-Step-7-Version-2.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-7-Version-2.jpg","bigUrl":"\/images\/thumb\/a\/ae\/Find-out-the-Size-of-a-Hard-Drive-Step-7-Version-2.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-7-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    )" icon under "Devices and Drives". This is your default hard drive, where the bulk of your files are likely stored.
    • Your hard drive may be labeled as "Local Disk (C:)" instead.
    • If you want to find out the size of a different currently connected hard drive, find the (letter) name for that drive instead.
  3. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/7\/7d\/Find-out-the-Size-of-a-Hard-Drive-Step-8-Version-2.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-8-Version-2.jpg","bigUrl":"\/images\/thumb\/7\/7d\/Find-out-the-Size-of-a-Hard-Drive-Step-8-Version-2.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-8-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    This will display your hard drive's specifications. [3]
  4. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/b\/b6\/Find-out-the-Size-of-a-Hard-Drive-Step-9-Version-2.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-9-Version-2.jpg","bigUrl":"\/images\/thumb\/b\/b6\/Find-out-the-Size-of-a-Hard-Drive-Step-9-Version-2.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-9-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    The "General" tab displays your hard drive's total memory, used memory, and remaining memory as a graph. Find the "Capacity" value to see your hard drive's total space.
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Method 3
Method 3 of 4:

Mac

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  1. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/2\/2a\/Find-out-the-Size-of-a-Hard-Drive-Step-10-Version-2.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-10-Version-2.jpg","bigUrl":"\/images\/thumb\/2\/2a\/Find-out-the-Size-of-a-Hard-Drive-Step-10-Version-2.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-10-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    This will bring up the Apple Menu.
  2. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/1\/19\/Find-out-the-Size-of-a-Hard-Drive-Step-11-Version-2.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-11-Version-2.jpg","bigUrl":"\/images\/thumb\/1\/19\/Find-out-the-Size-of-a-Hard-Drive-Step-11-Version-2.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-11-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    This should launch a small window with system details, such as your operating system version.
  3. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/3\/37\/Find-out-the-Size-of-a-Hard-Drive-Step-12-Version-2.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-12-Version-2.jpg","bigUrl":"\/images\/thumb\/3\/37\/Find-out-the-Size-of-a-Hard-Drive-Step-12-Version-2.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-12-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    The "Macintosh HD" icon should be the first entry on the top--this is your default hard drive. [4]
  4. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/e\/ef\/Find-out-the-Size-of-a-Hard-Drive-Step-13-Version-2.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-13-Version-2.jpg","bigUrl":"\/images\/thumb\/e\/ef\/Find-out-the-Size-of-a-Hard-Drive-Step-13-Version-2.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-13-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    Next to the "Macintosh HD" icon, it will say something like "X amount free of Y amount", where "X" is your remaining space and "Y" is your hard drive's total capacity.
    • Mac hard drives show a breakdown of what file types are consuming the most hard drive space. Use this to target large files if you're trying to clear some space.
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Method 4
Method 4 of 4:

IOS

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  1. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/f\/f8\/Find-out-the-Size-of-a-Hard-Drive-Step-1-Version-3.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-1-Version-3.jpg","bigUrl":"\/images\/thumb\/f\/f8\/Find-out-the-Size-of-a-Hard-Drive-Step-1-Version-3.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-1-Version-3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
  2. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/d\/d8\/Find-out-the-Size-of-a-Hard-Drive-Step-2-Version-3.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-2-Version-3.jpg","bigUrl":"\/images\/thumb\/d\/d8\/Find-out-the-Size-of-a-Hard-Drive-Step-2-Version-3.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-2-Version-3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    Look for the "Storage and iCloud Usage" tab.
    • For Android, find the "Storage" tab and select it. [5]
  3. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/1\/15\/Find-out-the-Size-of-a-Hard-Drive-Step-3-Version-4.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-3-Version-4.jpg","bigUrl":"\/images\/thumb\/1\/15\/Find-out-the-Size-of-a-Hard-Drive-Step-3-Version-4.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-3-Version-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    Under "Storage" (which covers your phone's internal hard drive) and "iCloud" (which covers your online-based cloud storage), you can see how much memory you are currently using and how much is remaining.
    • If you have an Android with an SD card, you'll have a drive option for your phone's internal storage as well as the card. These different drives are under "Internal Storage" and "SD Card", respectively.
  4. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/5\/55\/Find-out-the-Size-of-a-Hard-Drive-Step-4-Version-4.jpg\/v4-460px-Find-out-the-Size-of-a-Hard-Drive-Step-4-Version-4.jpg","bigUrl":"\/images\/thumb\/5\/55\/Find-out-the-Size-of-a-Hard-Drive-Step-4-Version-4.jpg\/aid841351-v4-728px-Find-out-the-Size-of-a-Hard-Drive-Step-4-Version-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    This will tell you your hard drive's total capacity for file storage
    • Note that a portion of the hard drive is dedicated to the operating system and other non-retrievable system files, so your actual total space won't quite match the number associated with your phone model (e.g. 32GB, 64GB)
    • You can also view your phone's effective storage capacity and currently available space under the "About" tab in the "General" menu.
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    This feature shows you how memory is being used by apps, images, or other information.
    • Use this feature to clear up space. For example, if you see that several gigabytes of your used space come from saved conversations, you can free up that space by deleting those conversations.
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    What if your hard disk is full?
    Community Answer
    If your hard disk is full, you will need to remove content in order to continue storing information. You can do this by moving files to an external hard drive or cloud service, or you can simply delete unused files.
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      Tips

      • 3.5 inch drives are standard for desktop computers, while laptops will almost always have a 2.5 inch hard drive. [6]
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      • If you have your computer or phone's serial number, you can look the model up to see what the default hard drive capacity is.
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      • Pictures, videos, and media-heavy conversations all take up a lot of memory. Consider clearing these out or backing them up every once in awhile to free up some space.
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      References

      1. ↑ https://www.ifixit.com/Answers/View/100801/How+to+remove+the+hard-drive+for+disposal
      2. ↑ https://www.engadget.com/2012/09/10/western-digital-builds-5mm-thick-hybrid-hard-drive/
      3. ↑ http://www.windowscentral.com/windows-10-check-free-space-hard-disk
      4. ↑ http://www.macinstruct.com/node/414
      5. ↑ http://www.androidcentral.com/how-much-memory-left
      6. ↑ http://techreport.com/review/9378/2-5-serial-ata-hard-drive-round-up

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