I want to transfer ~1.26TB folder from an ExFat HD to my new ExFat HD but there's problems

[Appletise]

Thought it be a simple task of just dragging the folder from old USB3 Exfat external HD into the new USB3 HD, which has also only been reformatted as Exfat using Disk Utility. So thought it was a matter of waiting, took literally hours ~ 7 hours! Both are 4TB drives, problem is the transfer failed, only 2188 files of the 12,710 filed, folder successfully transferred, meaning l have to manually transfer ~ 1000 files a time. is this unreliability of transfer normal, so have to resort to breaking down the transfer manually, transferring about 136GB a time? how to get a faster transfer? my mbpr 2012 has 2 thunderbolt connections but not sure if can get a thunderbolt cable for the 4TB WD my passport HD.
thanks in advance

 

[DogHouseDub]

Perhaps an app like GoodSync can handle that for you? I've used it for similar tasks in the past.

 

[worldvirus]

try synctwofolders https://www.macupdate.com/app/mac/22644/synctwofolders
works well for me

 

[jeremysteele]

If it is failing that badly, it is possible one of the drives (or file systems) may be bad. That much unreliability is far from normal.

 

[hobowankenobi]

Not normal....but there could be lots of reasons. USB weirdness, sleep, Finder/permissions, etc.

As mentioned, a good sync tool is the best way to go, as most (good options) will transfer what they can, have a log, and let you see and verify what is moved, and what is not....so you can be sure to NOT miss anything.

Tons out there, and dont forget that most of the best paid tools have a free demo period. CCC and GetBackup are both great for this sort of large data copy, especially if it takes repeated attempts. A free and easy, though less full featured tool that gets installed right into the Finder called Duplicate is worth looking at too.

 

[Audit13]

This is definitely not normal. Maybe it has to do with the file system on the drive receiving the files? Maybe format the receiving drive as HFS and try again?

 

[Fishrrman]

I agree with Audit above.

I suggest you format "the target drive" as Mac OS extended with journaling enabled.
Get the two drives connected to your Mac.

Are all the files (all 1.26tb of them) just "loose" in a single folder?
Or... are they in subfolders inside?
Are you using the finder to try to copy them?
Are you aware that (when copying a large number of files) if the finder encounters "a bad file" it will abort the ENTIRE COPY?

My advice is "don't copy it all at once".
Instead, copy a little at a time and keep handwritten notes.
Do about 10gb at a time to start.
Then try "larger blocks".

HERE'S SOMETHING THAT YOU SHOULD ALSO TRY:
In fact, try it FIRST:
Download CarbonCopyCloner.
http://www.bombich.com/download.html
CCC is FREE to download and use for 30 days.

Make sure the target is HFS+.
I -think- CCC can read exFAT but it can copy only to a Mac-formatted drive.
You're going to have to try it yourself.
But trying this COSTS YOU NOTHING.
Now, try using CCC to clone from the exFAT drive to the HFS+ drive.

WHY I'm suggesting you do this:
As I mentioned above, if you try a finder copy and it encounters a bad file (even just one "bad one" in 100,000), the finder will ABORT the copying process.

BUT...
When CCC encounters a bad or corrupted file during the cloning process, IT DOES NOT QUIT. Instead, it makes note of the bad file, and then keeps on going.
CCC will copy "all the good files" while making note of the bad ones.
After the cloning is done, I believe that CCC will present you with a list of the corrupted files.

If you try this, and if it works, please come back and post your results.