My SanDisk USB shows that 40GB is used when I just copied a 10GB file after formatting

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I recently bought a 128GB USB from SanDisk.



Just as the title, after formatting the USB in exFAT format, I copied a folder whose capacity is around 10 GB. (There are lots of small files in it, so it took some time)



However, when I see in the Windows Explorer after copying the folder, it says that around 43 GB of the storage is occupied and now only 70 GB of the storage is free to use.



What the hell is happening and how should I deal with it??



Is my USB physically broken?



It is still weird because when I copied a single file with 7 GB capacity, it showed the remaining capacity correctly. (around 110 GB available)






usb






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  • 2




    If you right click on a small file and go to properties what does it display for "size" and "size on disk"
    – Scott Chamberlain
    3 hours ago














up vote
1
down vote

favorite












I recently bought a 128GB USB from SanDisk.



Just as the title, after formatting the USB in exFAT format, I copied a folder whose capacity is around 10 GB. (There are lots of small files in it, so it took some time)



However, when I see in the Windows Explorer after copying the folder, it says that around 43 GB of the storage is occupied and now only 70 GB of the storage is free to use.



What the hell is happening and how should I deal with it??



Is my USB physically broken?



It is still weird because when I copied a single file with 7 GB capacity, it showed the remaining capacity correctly. (around 110 GB available)






usb






share

















  • 2




    If you right click on a small file and go to properties what does it display for "size" and "size on disk"
    – Scott Chamberlain
    3 hours ago












up vote
1
down vote

favorite









up vote
1
down vote

favorite











I recently bought a 128GB USB from SanDisk.



Just as the title, after formatting the USB in exFAT format, I copied a folder whose capacity is around 10 GB. (There are lots of small files in it, so it took some time)



However, when I see in the Windows Explorer after copying the folder, it says that around 43 GB of the storage is occupied and now only 70 GB of the storage is free to use.



What the hell is happening and how should I deal with it??



Is my USB physically broken?



It is still weird because when I copied a single file with 7 GB capacity, it showed the remaining capacity correctly. (around 110 GB available)






usb






share













I recently bought a 128GB USB from SanDisk.



Just as the title, after formatting the USB in exFAT format, I copied a folder whose capacity is around 10 GB. (There are lots of small files in it, so it took some time)



However, when I see in the Windows Explorer after copying the folder, it says that around 43 GB of the storage is occupied and now only 70 GB of the storage is free to use.



What the hell is happening and how should I deal with it??



Is my USB physically broken?



It is still weird because when I copied a single file with 7 GB capacity, it showed the remaining capacity correctly. (around 110 GB available)






usb




usb





share












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asked 3 hours ago









Felix Lee

165




165







  • 2




    If you right click on a small file and go to properties what does it display for "size" and "size on disk"
    – Scott Chamberlain
    3 hours ago












  • 2




    If you right click on a small file and go to properties what does it display for "size" and "size on disk"
    – Scott Chamberlain
    3 hours ago







2




2




If you right click on a small file and go to properties what does it display for "size" and "size on disk"
– Scott Chamberlain
3 hours ago




If you right click on a small file and go to properties what does it display for "size" and "size on disk"
– Scott Chamberlain
3 hours ago










1 Answer
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You already answered your own question: There are lots of small files in it



Every file on an exFAT volume takes at least one blocksize. So a file of a single byte in size takes 4K - a size amplification of 1:4096. You are seing a size amplification of 4.3, which is very plausible with lots of small files.



You can check this hypothesis by packing the files with WinRAR and the zero compression settings, then copy this file to the USB stick.






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    up vote
    4
    down vote













    You already answered your own question: There are lots of small files in it



    Every file on an exFAT volume takes at least one blocksize. So a file of a single byte in size takes 4K - a size amplification of 1:4096. You are seing a size amplification of 4.3, which is very plausible with lots of small files.



    You can check this hypothesis by packing the files with WinRAR and the zero compression settings, then copy this file to the USB stick.






    share|improve this answer
























      up vote
      4
      down vote













      You already answered your own question: There are lots of small files in it



      Every file on an exFAT volume takes at least one blocksize. So a file of a single byte in size takes 4K - a size amplification of 1:4096. You are seing a size amplification of 4.3, which is very plausible with lots of small files.



      You can check this hypothesis by packing the files with WinRAR and the zero compression settings, then copy this file to the USB stick.






      share|improve this answer






















        up vote
        4
        down vote










        up vote
        4
        down vote









        You already answered your own question: There are lots of small files in it



        Every file on an exFAT volume takes at least one blocksize. So a file of a single byte in size takes 4K - a size amplification of 1:4096. You are seing a size amplification of 4.3, which is very plausible with lots of small files.



        You can check this hypothesis by packing the files with WinRAR and the zero compression settings, then copy this file to the USB stick.






        share|improve this answer












        You already answered your own question: There are lots of small files in it



        Every file on an exFAT volume takes at least one blocksize. So a file of a single byte in size takes 4K - a size amplification of 1:4096. You are seing a size amplification of 4.3, which is very plausible with lots of small files.



        You can check this hypothesis by packing the files with WinRAR and the zero compression settings, then copy this file to the USB stick.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 3 hours ago









        Eugen Rieck

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