What is meant by Copy Error Code 0 in Mac OS X

Error Code 0Whether you guys have ever copied large files just to external hard drives or the USB flash drives in macOS. You probably have experienced an unidentified error, however, the description of which is entirely uninformative. Similarly, something only like “The operation could not be completed because an unexpected error occurred (error code 0).” Therefore in today’s article, I will tell you that what it means, why it arises & also the way to deal with it.

What is meant by Copy Error Code 0 in Mac OS X

Factually, most external hard drives & also the USB flash drives, whether they are not sold as deliberately compatible with Mac products, simply use FAT or FAT32 as the file system. However, these systems were extensively used in ancient Windows, which is enhanced in the distant 1990s, until it was put back by the more progressive for those times NTFS.

However, the just reason that detachable drives such as flash drives, memory cards & further drives are still utilizing the FAT32 is its versatility, more definitely, cross-platform compatibility with macOS, Linux & Windows. Additionally, on any platform, utilizers are able to also painlessly both read & write data on such a file system. Whilst just out of the box writing to NTFS is available just in Windows.

Must read this guide: How to Fix: Siri not talking back to you? Guide


Unluckily, in spite of the technical progress, the emergence of current file systems also their own moral old age. Scarcely any one of the major enhancers of the drives instantly ceases to support FAT32, setting an instance for the rest. Regardless, in most cases, an unknown error simply with the zero code probably occur due to copying large files to an external hard drive formatted in FAT32.

Though do not rush to criticize the Finder or macOS for all deadly sins. Just because, like Windows/Linux, they are unable to do anything. However, these are the “rules of the game”: the maximal size of the file for a volume with FAT32 must be less than 4 GB. A flash drive is also able to be 32 GB. But the size of each file should not easily exceed the priorly specified limit.

Therefore now let’s try for finding a solution to the issue. For instance, whether you are trying to copy a large archive (ZIP, RAR, DMG). Next, you are also able to unpack it. And also transfer it into separate files & folders of about the exact size.

Otherwise, whether you just use the drive in order to work with macOS. Well, guys, it is much better to entirely abandon FAT32 & also format the USB flash drive/disk in the native format for the desktop OS – HFS+. This needs:

  • Firstly you guys have to make a backup of data on another disk after all formatting will vanishes all files & folders;
  • So guys in the “Disk Utility” (in the sidebar) you have to choose the external drive;
  • Tap the “Erase” tab & in the Format scroll-down menu choose the Mac OS Extended (Journal). And below you have to must enter the Volume label;
  • And simply tap on the ”Erase” button.


Well, guys the Error code 0 typically comes with a message that is shown as a “The operation could not be completed because an unexpected error occurrs (error code 0).” These further sounds are unreal/strange. But guys this is the real cause of this problem. Though when this error takes place, so guys it is seen that most of the external drives such as the USB flash drives are formatted with the FAT or FAT32 file system.

Moreover, Windows uses the NTFS file system, however, that frequently is incompatible with Mac OS X & also Linux devices. That enables Mac & Linux users in order to read and write data as well in the wrong way. Unluckily, no matter even whether it’s compatible with various platforms, though the FAT32 file system displays to be quite outdated & which leads to very serious problems.

Although all these above issues are the main cause of Mac error code 0. And also one of the important reasons is that it happens whilst the files are being copied that are large and are far away from the 4GB.

Also see: Way to Check Hard Drive Health of a Mac with Disk Utility

Way to Fix the Error Code 0 on Mac devices When Copying Large Files

Compress the file

  • Just to cope with this error, the first step that you must take is to make the files smaller. It should be taken into consideration though that no single file is larger than 4GB. Or no matter what even whether it is your external drive.
  • Simply this plainly defines that you are unusually having a large file. And must have to use the compression systems like the zip, rar, and dmg (or creating a disk image).

Reformat the external drive

  • Well, guys, your second option is straightforwardly to reformat the external drive. Or also your USB drive just by using the Mac OS X’s file system. Though that is HFS+. This will support you to overcome with file problem of size 4GB.
  • Moreover, it will enable users just to copy files of any size offered that it fits fine with the overall ability of your external drive.


Unluckily, the Windows PC just without the “preliminary preparation” is unable to even show a list of files & folders. But this is not an awful case. Just because you guys are also able to always install an app such as the MacDrive in Windows. Teach Mac OS X in order to write the data to NTFS, or copy content over a local network by using the General Access.

Must read this article: Way to Undo on Mac & Redo on Mac – Tutorial Guide

Leave a Reply

Your email address will not be published. Required fields are marked *