Not recognizing external hard drive

i have used the seagate and Sony external hard disk and i had the same problem. Just try the below things to make it working(it worked for me)

Just try to format your external hard disk with Mac OS Extended (Journaled). Follow the below link for formatting

Format external drives to Mac OS Extended before using with Aperture - Apple Support

or you can try downloading paragon software which will give you read and write access without formatting the external hard disk(But this software is not free).

https://www.paragon-software.com/home/ntfs-mac/

Or

Download a file explorer for windows which will detect the hard disk which have been used on mac

hfsexplorer is one among them which gives window users access to read and write the external hard disk used by mac

Hi JasonFear,

I just followed those instructions and I was able to find that my external hard drive is in fact being read - but I'm not entirely sure how to get it to actually work on my MacBook Pro.

Any suggestions ?

-O

There is something weird about the cabling with the 1TB Toshiba HD I have. I finally hooked it up to an old USB 4 port bus, without external power, and the bus into the 2015 MBPro and it picked it right up. I can see the previous backups from my older MacBook too, plenty of room on the Toshiba still. So it didn't need me to clean the external HD, or need more power, just a different cable. There is a video out there showing some guy hooking up a longer cord, which also did the trick, don't know where he got the proper cable though. There is a special male end that goes into the Toshiba. Oh, this is exciting, better stop!

First, see if they are listed. Issue the command

diskutil list

My relevant output, again using my non-mountable USB as an example is as follows:

/dev/disk4 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: Apple_partition_scheme +15.6 MB disk4 1: Apple_partition_map 32.3 KB disk4s1 2: Apple_HFS True Key 15.6 MB disk4s2 /dev/disk5 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: FDisk_partition_scheme *8.0 GB disk5 1: Windows_FAT_16 2.1 GB disk5s1 <----- My Problem Child

Eject the disk using the command

diskutil eject disk5

(Obviously use the disk number that associated with your USB device)

Running

diskutil list

/dev/disk4 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: Apple_partition_scheme +15.6 MB disk4 1: Apple_partition_map 32.3 KB disk4s1 2: Apple_HFS True Key 15.6 MB disk4s2

Now, physically remove, then reinsert the USB drive. Your drive should be functioning again.

This worked for me using a MacBook Pro with Retina Screen 2013 and a WD Elements 2TB drive.

1. Relaunch the Finder.

The discs may be mounted and available; however, if the Finder is having troubles displaying them then it may appear as though the discs are not mounted. Press the Option key and right-click the Finder icon in the Dock, and choose "Relaunch".

Hi, wanted to share my other solution. I also experienced this problem, not reading external HDD in MAC but working in Windows computer, It also work when you open your External HDD in MAC but no file can be found.

Insert your external HDD in Windows computer.

Go to Exernal HDD drive > right click > properties > Tools

On Tools tab click CHECK in Error Checking.

Wait till it finish checking, after that remove external and try using it in MAC.

It work for me many times. Hope it helps others too.

Under system Information, I find the following:

USB 3.0 Bus:

Host Controller Driver: AppleUSBXHCIPPT

PCI Device ID: 0x1e31

PCI Revision ID: 0x0004

PCI Vendor ID: 0x8086

Elements 1048:

Product ID: 0x1048

Vendor ID: 0x1058 (Western Digital Technologies, Inc.)

Version: 10.22

Serial Number: 575833314136333031383136

Speed: Up to 5 Gb/sec

Manufacturer: Western Digital

Location ID: 0x14400000 / 3

Current Available (mA): 900

Current Required (mA): 896

Extra Operating Current (mA): 396

Media:

Elements 1048:

Capacity: 2 TB (2,000,396,746,752 bytes)

Removable Media: No

BSD Name: disk1

Logical Unit: 0

Partition Map Type: APM (Apple Partition Map)

USB Interface: 0

Volumes:

disk1s1:

Capacity: 32 KB (32,256 bytes)

BSD Name: disk1s1

Content: Apple_partition_map

Tim's 2TB WD:

Capacity: 2 TB (2,000,262,488,064 bytes)

File System: HFS+

BSD Name: disk1s3

Content: Apple_HFS

Volume UUID: 097F72E0-38C9-324D-9C10-45AADAC23149

When using Disk Utility in Safe Mode, the computer can see the hard drive but cannot repair it. When booting up normally, the hard drive doesn't appear in Disk Utility.

* SOLUTION FOUND! * Use your thumb to apply upward (or downward) pressure at the connection point where USB plugs to the drive (you will feel minor vibration when it recognizes and starts up) keep applying the angled pressure as you one-handedly drag all files from this drive to another cause this may be your only chance to get all your files off the problem drive.

Good Evening,

Hello Guys I have The Solution for This Just Goto The Official Link And Please Download The File

http://www.seagate.com/support/external-hard-drives/portable-hard-drives/goflex/ ntfs-driver-for-mac-os-master-dl/