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repair external hard drive

i have a high quality external ssd hard drive, that i only use on my nice macbook pro. extra factors are that i have security software, use new cables, and use a power surge protector. my data is standard day to day stuff. unfortunately data has disappeared and the drive is unable to be imaged or recovered. im really concerned.


disk utility verifies that the two partitions of this external drive are healthy, but when I try first aid on the head device WD Exfat, Disk Utility encounters a problem.


"First Aid process has failed. If possible back up the data on this volume. Click Done to continue."


"Fixing damaged partition map."

"Couldn’t modify partition map. : (-69874)"


"Operation failed…"


your assistance is valued


thanks

MacBook Pro 15", macOS 10.15

Posted on Dec 15, 2019 4:20 PM

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7 replies

Dec 15, 2019 7:35 PM in response to Tesserax

ive connected it to both macbook pro and windows computer just fine .


most of the data on the first partition is all there , and unfortunately a lot of data on the second partition is mysteriously missing . but basically the drive is viewable and usable on windows and mac - since it should be a healthy exfat . ive cared nicely for the drive and the hardware is beautiful . windows seems to scan and verify it as healthy with the scan checking tool , and mac shows it as partitions being perfectly healthy except head parent drive WD Exfat having that error seen above . WD Discovery checker shows it as completely healthy on all three stages of scanning , and also EASE US test shows completely healthy all sectors .


i sense that if this minor error could be repaired , that my data may just reappear again or i could easily continue imaging and recovery . right now its just a nice drive that has some missing data and is refusing to be imaged or recovered . if you have any ideas about terminal functions for disk repair (possibly diskutil and fsck ? ) , maybe that could correct this partition map error ?


i am sensing that it has minor corruption due to using a recovery software on it this week , and because of a mount problem - i had to disconnect power in order to reboot . so that's not bad damage , just an error which may have contributed to partition map issues .


i may have to format the stupid thing and recover , which im considering . i just dont usually do that whenever a minor corruption has happened . i usually try disk utility , and that has fixed most of my issues with the one-click repair capability .

Dec 15, 2019 7:38 PM in response to leroydouglas

i have not tried the erase step yet , as i want to avoid the process of recovery after erasure .


the drive is mounting fine , and i dont see the initialize selection . that's the weird thing , is that the drive is in great condition , most repair scans show it is healthy - except for the parent scan showing the error :


"Fixing damaged partition map."

"Couldn’t modify partition map. : (-69874)"


. it's just data is missing and it is refusing to be imaged and recovered .


i may have to format this thing to fix the kink regarding minor corruption . in its state right now , it has some sort of error that happened in the past few days .

Dec 15, 2019 8:39 PM in response to Foreverholy111

How is this external drive currently partitioned? You mentioned two partitions. Are both formatted for ExFAT?


With this drive attached to your MacBook Pro, run the Terminal app, and then, enter the following command: diskutil list


Please provide a screen shot of the results and identify which is the correct external drive if you have more than one attached to your notebook.

Dec 16, 2019 3:43 AM in response to Tesserax

it is partitioned as MBR and both partitions are Exfat , for safe use on both windows and mac .


Terminal has been opened and


diskutil list


was typed in


/dev/disk2 (external, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:     FDisk_partition_scheme                        *2.0 TB     disk2

   1:               Windows_NTFS SSDexfatA               1.0 TB     disk2s5

   2:               Windows_NTFS SSDexfatB               1.0 TB     disk2s6


that is the external drive . Master Boot Record WD SSD device formatted with two Exfat partitions .


repair external hard drive

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