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Blog Pourquoi ne puis-je pas copier des fichiers volumineux sur ma clé USB?

Problème
Vous avez une clé USB de 8 Go. Elle est complètement vide et vous souhaitez y copier un fichier volumineux, disons de 5 Go. Cependant, vous continuez à obtenir un message indiquant « espace libre insuffisant », malgré le fait il y ait beaucoup d’espace libre sur la clé USB.

Pourquoi ce message apparaît-il ?
La plupart des clés USB sont formatées avec un « système de fichiers FAT32 ». Ce système a été créé en 1995 et, pour des raisons de protection informatique, impose des restrictions sur la copie d'un fichier sur votre clé USB si elle dépasse une capacité de 4 Go – c’était énorme à l’époque !

Cependant, Microsoft a créé ce qu'on appelle la « table d'allocation de fichiers étendu (ExFAT) », solution qui résout une partie des problèmes des utilisateurs de Microsoft Windows. Ici, à Flashbay, nous utilisons le système ExFAT pour formater nos clés USB de 64 Go ou celles qui ont des fichiers individuels de plus de 4 Go de données préchargées. Toutes nos autres clés sont formatées avec le système FAT32.


Solution
1) Assurez-vous que votre clé USB est vide et que vous avez sauvegardé vos fichiers dans un endroit sûr sur votre PC ou ordinateur portable

2) Accédez à votre dossier "Poste de travail" et faites un clic-droit sur l'icône de votre clé USB, puis sélectionnez « Formater »

3) Vous allez maintenant voir une fenêtre avec une option « Formater ». Sélectionnez 'ExFAT' dans le menu déroulant. Il existe aussi une option NTFS, également utilisable dans certains cas. Plus d'informations ici.

4) Cliquez sur «Démarrer» et le changement de système depuis FAT32 à exFAT débutera. Cela va prendre environ 2 minutes.

C'est tout. Maintenant, vous pouvez copier des fichiers de plus de 4 Go sur votre clé USB, si vous avez suffisamment d'espace sur elle, bien sûr !

Intéressé par des clés USB personnalisées ?
Il vous suffit de remplir le formulaire de demande de devis et l'un de nos gestionnaires de compte vous contactera dès que possible.


flashbay Auteur:Sam Sanchez
19 Commentaires | Laissez les vôtres 
Chris , Flashbay | 11 May, 2022
Hi Madeleine, 

Thanks for your question.

Some of the TV Shows you're trying to copy to your Flash Drive may be more than 4GB each. If that's the case, you need to follow the steps listed in this blog post - if you haven't already done so.

If you're still receiving an error message, your Flash Drive may be faulty. It's highly unlikely that 4 TV Shows will consume the entire 64GB capacity.

I hope this helps.

Many thanks,

Chris at Flashbay
Madelein | 06 May, 2022
Hi I have a 64gb usb trying to cooing television shows on them after 4 episodes the others won't work o have tried everything
Kara | 01 May, 2022
Thank you! Mine was in exFAT already but the kilobytes were at a very low default setting. I have folders by the year for family photos that I am storing. Still you were able to teach me something new and I found the screen that helped me adjust to what I needed.
iamLOKEE | 07 Feb, 2022
Learnt something new. And my problem is solved too.
Thanks to the author.
Vincent Gwaya, Vince Media | 03 Jan, 2022
Thanks you have help me alot.
vincent gwaya | 03 Jan, 2022
My flash disk is 15GB.I have formated it.I want to copy a video file which is 13GB but when I want to copy a message apearswhich say 'the file is too big'what can I do?
Sergio | 31 Dec, 2021
I need to copy mp3 files from an 8gb USB drive to a 4gb USB drive. The 8gb has about 6gb of mp3 and I want to transfer as much of the files that can fit into the 4gb. Is there a way I can drag and drop the full amount and let some software just transfer what fits?
Graham Ecob | 30 Nov, 2021
Thanks - I was at a loss to understand why it wouldn't copy a large file.
Beth | 16 Sep, 2021
This worked perfectly and took less than a minute!! Thank you for the great information :-)
Steve | 25 Aug, 2021
Thank you.
Your info was great.
Rancor | 10 Jun, 2021
You may need to increase the unit allocation size in order to transfer large files. Mine was set to Exfat128kb and it still wanted more before I could move a 5 gig file.
Deepak | 07 Jun, 2021
Its just easy.  Open your your Hard drive as a portable device and then transfer.  Easy peasy.
Sara | 01 Feb, 2021
Hi Chris
Thank you for your help. I reformatted the usb again to exFat and this time it worked.
Chris , Flashbay | 01 Feb, 2021
Hi Sara,

Thanks for your question.

Without knowing all of the details, it's hard to give a completely accurate answer.

exFAT can handle file sizes of 20GB and above, so it may be an issue with the available space on your drive (unlikely, as I suspect you've already checked this). Or it could be an issue with the actual file you're trying to move. 

It may also be a conflict with your antivirus software, in other words the software may be 'blocking' the file move. Please check your software settings.

Another option is to try formatting the Flash Drive to NTFS if you can, which is a more modern file system, compared to exFAT.

I hope this helps.

Many thanks,

Chris at Flashbay
Sara | 30 Jan, 2021
I purchased a WD eaststore 128GB flash drive. My 128 GB flash drive is already formatted to exfat and it still won't let me move an 20 GB file. 

Please advise.
Cynthia Harrison | 09 Apr, 2020
My 128 GB flash drive is already formatted to exfat and it still won't let me move an 8 GB file.
Sonu | 09 Nov, 2019
Very usefull thanks sir
Mia lee | 17 May, 2017
I was also unable to copy files to my Hard disk the file size was 8 GB and hard disk was 150. I didn't knew what was the problem at that time. After searching I found that it supported FAT32 file type and more than 4 GB file could not be copied. After trying many software which I didn't found satisfactory I found GS Richcopy 360. Although its a paid software but its just awesome. I copies the file file permissions too. Not only that it also solved my problem of long path name. Its other features include multi threaded file transfer, pre scheduled file transfer, email notification when the transfer is done and many more. Try it, its awesome!
Kumar | 08 May, 2017
Well, I too had this same problem and I thought to myself that Windows doesn't math it seems! But after knowing the fact that these drives are FAT32 type and maximum file size is 4GB I got my answer.  After knowing the fact, I started to search answers for it and then one site I found a software named GS Richcopy 360. Reviews were quite impressive so I tried it and it did solved all my problems including long path name support. Now, I have been using this software for around 2 years and its just amazing. Try it hope it helps!
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