Error Code 8076 - What to Do?

It is hard to say, FAT32 formatting is for crossplatform read/write functionality. It is horrible for Mac OS bootable information. A 5 year old drive may already be long in the tooth. http://www.binaryfruit.com/ DriveDX does have a paid release that looks at the health of external drives too. Once a drive gets over 85% full, its use in swap files can often lead it to get too full to manage larger files. I would copy what you can to an APFS formatted drive, and see if it works better there:

How to format a drive, or disc for maximu… - Apple Community

File sharing with Windows over a network often works better than trying to play sneakernet with larger drives.

The error code will -8076 generate when you will try to move, copy or modify any files and folders in Mac operating system based computer. This is a data permission related error and the chances to loss data will increase when this error will occur on your computer. You will get an error message dialog box that you can see in the figure after facing this problem. You won't be able to modify and copy your data after occuring the error code -8076 on Mac computer so it is necessary to fix this issue and recover the data from your PC.

a brody wrote:

http://www.binaryfruit.com/ DriveDX does have a paid release that looks at the health of external drives too.

FYI, the free version of DriveDx can check the health of external drives as well, but requires installing a special USB driver.

AFAIK, the trial version has full functionality except for the ability to run the long extended selftest.

BDAqua,

Thanks for verifying it. I'm not surprised. I wonder could someone virtualizing Windows on a Mac connect the hard drive and edit the permissions in such a way the Mac OS can handle it?

That’s a good idea to try!👍🏽