Announcement: Upgrade to macOS Mojave

With features like Dark Mode, Stacks, and four new built-in apps, macOS Mojave helps you get more out of every click. 
Find out how to upgrade to macOS Mojave > https://support.apple.com/macos/mojave

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

Question:

Question: External HD correctly formatted returns error

Hi All,


I have got a WD External hard disk and it has been formatted correctly to Mac OS Extended Journaled.


I then transferred loads of files to it with no problems.


Today, I was doing the second back up session, and I tried to merge two files on the hard disk so I keep whatever on the hard disk PLUS the new stuff I am pasting.


However, I was stopped with an error message:

"The operation can’t be completed because an unexpected error occurred (error code 0)."


This message means the external hard disk is formatted as FAT or FAT32 and therefore it shows this message when I am trying to transfer stuff bigger than 4GB.


But the hard disk is already formatted as Mac OS Extended Journaled.


Any idea how to solve this issue? or why it is happening?


I am using High Sierra.

Posted on

Reply

Page content loaded

Mar 10, 2018 3:13 PM in response to dyski In response to dyski

Did you open Disk Utility to check the external drive's formatting? If it's formatted properly then the error does not mean it is formatted using FAT. Did you check to see how much data has already been transferred to the drive? Are you aware that you cannot merge "files." Only folders can be merged where new files will replace old ones.

Mar 10, 2018 3:13 PM

Reply Helpful

Mar 13, 2018 5:59 AM in response to Kappy In response to Kappy

Hi Kappy,


Yes, I checked the external disk formatting in the disk utility and it says:

USB External Physical Volume • Mac OS Extended (Journaled)


There is 598.9 GB of data currently on the external hard disk.


This external hard disk includes folders identical to what I have on my MacBook Pro.

Like:

Documents

Music

Movies

Pictures


These folders and their contents were copied from the my laptop a month ago when I bought and formatted the external hard disk for back up purposes.


The other day I wanted to update that back up.


So I right clicked the "Pictures" folder on my laptop and clicked Copy.


Then on the external HD I clicked Paste.


Then a message appeared saying the following:

==============

An older folder named “Pictures” already exists in this location. Do you want to merge or replace it with the newer one you’re copying?


Merge will combine the two folders, preserving all the newer items such as “P1020325.JPG” and 1,087 other items.

==============


I clicked Merge, because I don't want to lose the contents on the external HD, I just want it updated with the new pictures.


But then, that error message appears:

"The operation can’t be completed because an unexpected error occurred (error code 0)."

Mar 13, 2018 5:59 AM

Reply Helpful

Mar 13, 2018 11:08 AM in response to dyski In response to dyski

I don't know much about the error other than it is an I/O error. This could mean a damaged file or it could mean a bad spot on the disk. I would check each folder to see if you can identify the file causing the error. Then try copying just that file to the folder. Sometimes the Finder has problems transferring a large number of files, thus, generating an error. If this isn't possible then I suggest copying the files manually in smaller groups to see if that works.

Mar 13, 2018 11:08 AM

Reply Helpful

Mar 14, 2018 2:15 PM in response to dyski In response to dyski

I use dedicated drives for each computer. Each computer will have two dedicated backup drives plus a dedicated Time Machine backup drive. The non-Time Machine backups are done using Carbon Copy Cloner which runs on defined schedules. One dedicated backup is performed daily. The other one is done monthly. The Time Machine backup does a weekly backup.


I do not use Windows. If I did then I would do so via Parallels which provides its own built-in sharing for transferring data. So, no, I have no experience with ExFAT.

Mar 14, 2018 2:15 PM

Reply Helpful

Mar 14, 2018 2:39 PM in response to dyski In response to dyski

Might really be a corrupted file from origin. I had a similar problem recently but differently from you were just a hundred files then I was able to identify the corrupted one and redo copy from the following in list.

Could also be a corrupted sector. How old is the disk? Assuming that the problem is in s file or destination disk but could also be in reading from the origin disk.

Also: kappy has a right method of backupping: based on my experience, one backup is like having no backup. Both my external Raid system and my Synology NAS have scheduled backup but my OS have daily backup and the Home folder has every six hours backup. Then the Home folder has an every 2 days backup on the NAS. The most important, the Home folder, has double backup. Am I paranoic? Maybe but since I've lost hundreds of photos (mainly of my children) deleted by mistake (and hardware fault can happen...) I'm no more sure about nothing. And my company's important datas get written twice on dvds (one on Apple's Superdrive and one on more reliable LG - as CDs and DVD are poorly reliable) every month.

Mar 14, 2018 2:39 PM

Reply Helpful

Mar 14, 2018 3:06 PM in response to majortom1967 In response to majortom1967

The external disks are new, less than 2 months old.


I only copied the files on them once, and this one now is the second time.


My computer is a MacBook pro, and I can't have an external disk attached to it all the time.


I have these 2 external hard disk and had the plan to sit every month or so, connect them, back up the stuff, and that is it.


But this issue now is worrying me and I really can't understand why it is happening.

Mar 14, 2018 3:06 PM

Reply Helpful

Mar 14, 2018 3:27 PM in response to dyski In response to dyski

Not sure a good test but:

- create Picture2 folder on destination disk

- open Terminal

- type: cp -R

- DRAG/DROP ORIGIN FOLDER

- DRAG/DROP Picture2 FOLDER

- press Enter


Let us know what happens. Post any error Terminal might return

Mar 14, 2018 3:27 PM

Reply Helpful

Mar 23, 2018 3:26 PM in response to majortom1967 In response to majortom1967

Hi majortom,


This is what Terminal returned:


dyski-mbp:~ dyski$ cp -R/Users/dyski/Pictures /Volumes/BACK\ UP\ 1\ 4TB/Pictures2

cp: illegal option -- /

usage: cp [-R [-H | -L | -P]] [-fi | -n] [-apvXc] source_file target_file

cp [-R [-H | -L | -P]] [-fi | -n] [-apvXc] source_file ... target_directory

Mar 23, 2018 3:26 PM

Reply Helpful

Mar 26, 2018 2:28 AM in response to majortom1967 In response to majortom1967

I will give it a try and let you know.


By the way, I tried to copy and paste the huge pictures files on a different folder on the external hard disk and it worked without issues.


I noticed that error message/problem happens when I do “merge” with an exisiting folder on the external hard disk.

Mar 26, 2018 2:28 AM

Reply Helpful
User profile for user: dyski

Question: External HD correctly formatted returns error