[Fixed] Cannot copy files because the parameter is incorrect

Overview 

A large number of users reported that they experienced the parameter is the incorrect error while trying to copy files from their computer to an external hard drive or USB device. You must be one of them if you come to this page. And I guess you might get one of the following messages:

"Error copying file or folder. The parameter is incorrect"
"Cannot copy file: The parameter is incorrect"

But don't worry! Here, a step-by-step tutorial is created to help you fix the issue of cannot copy files with the parameter is the incorrect error message. 

What causes the parameter is the incorrect error while copying files?

Usually, when you find you cannot copy files due to the parameter is the incorrect error, you may want to know what caused the issue. Next, we will explain what the parameter is incorrect means.  

Cannot copy files - The parameter is incorrect error often occurs when you are trying to copy a file larger than 4 GB in size from an NTFS or ReFS partition to a FAT32 partition, but the maximum size of a file that can be stored on FAT32 is 4GB.

Having figured out why you cannot copy files while the parameter is incorrect error occurs, it's easy to find a solution to fix it. You just need to convert FAT32 to NTFS. Reformatting the target drive is a way. To do it, open Windows Explorer, right-click the drive, select "Format". In the Format dialog, select the NTFS file system.

Best fix for cannot copy files - The parameter is incorrect error

As you know, reformatting will remove all data from the target hard drive. So if you think it is not the best way, here we offer you another choice - using EaseUS free partition software to convert FAT32 to NTFS without formatting. No data loss will happen during the whole process.

1. Connect the hard disk with the FAT32 file system to PC, launch EaseUS free partition tool.

2. Right-click the disk and select "Convert to NTFS" option.

3. The pop-up dialog box will show the source and destination file system, click "OK" to continue. Finally, click "Apply" to execute the operation.