Questions tagged [external-disk]

A storage device attached to a computer, but not enclosed within the computer's casing

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1answer
167 views

Can I use multiple partition external HDD connected to Apple Airport Extreme for Backups from both Mac and Windows PC

I have a 6TB external drive partitioned into two equal partitions. One is NTFS and the other is compatible with Time Machine backups. The drive is then connected to the Airport Extreme via USB. The ...
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51 views

Home directory on external drive…Catalina requires the external drive to be bootable

After a long discussion with Apple Support and being transferred to a senior support engineer, I was told that if my home directory was on an external drive that it now needed to have an OS on it and ...
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133 views

[Catalina]: GetMasterBlock: Error 1 opening /dev/rdisk2s2 during read-write mount

After upgrading to mac os catalina, I am unable to mount my external SSD drive in r/w mode. The external SSD drive is my time machine backup drive. $ sudo mount -v -u -w /dev/disk2s2 /Volumes/...
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67 views

How do I run Boot Camp Assistant on a partition on an external drive?

I've partitioned my external HD and I want to install Windows 10 on it using Boot Camp Assistant. When I open Boot Camp Assistant, it shows my whole Hard Drive, not my partition. I've got the Windows ...
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1answer
47 views

Uninitialized HDD after GPT to MBR conversation, 3 HFS+ Volumes and 1 ExFAT

2 TB External Hard Drive. Error during converting from GPT to MBR and now Disk can't be mounted. 'The disk you inserted was not readable by this computer' appears when HDD is plugging in. Files ...
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2answers
52 views

Connect Mac CD drive to another Mac

Question: Can I take apart a CD drive from an old MacBook Pro and connect it to a newer MacBook Pro that does not have a CD drive? Background: The old MacBook Pro is broken, but the CD drive still ...
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125 views

Output of diskutil info: dlopen(…): code signature in (…) not valid for use in process

When I run diskutil info on an external drive, the output contains errors that make me wonder if I need to be concerned about the security, or at least the stability of my computer: 2019-10-03 11:03:...
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2answers
2k views

Will Time Machine delete old backups for other computers on the same drive?

I have an external 500 GB HDD that I've used for Time Machine backups for three different computers: An old PowerBook G4 A white MacBook My current retina MacBook Pro I now have less than 100 GB ...
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2answers
9k views

Why is finder asking to authenticate when copying to my external hard drive?

macOS Sierra 10.12.6 (MacBook Air) I am trying to move a directory/folder from my local disk to an external hard drive. But I get an error that says: Modifying "Remote Disk" requires an ...
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1answer
261 views

External USB-C SSD not recognized on MacBook Pro

I am using a MacBook Pro Retina 15-inch (Mid, 2015) running macOS Catalina 10.15 Beta (19A558d). I want to use an external USB-C SSD drive (512GB) to use Windows To Go and store other files. Since my ...
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44 views

Unable to Erase External Hard Drive - Unable to lookup the APFS Container Reference

I have an external hard drive that I put a linux operating ISO on, but now I am trying to erase the external back into ExFat format to store files on it. When I go into DiskUtil, and try to erase it, ...
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1answer
53 views

Does skipping “device enrollment” make files inaccesible to supervisor?

Basically, I have a MacBook pro issued from work, I want to play some games so I have installed macOS X on external drive and boot from it. Now I get "device enrollment" notification every few hours ...
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27 views

How do I get rid of a re-appearing B&W hard drive icon on my macOS desktop?

I have an iMac running OS X Yosemite 10.10.5 and an external hard drive with 3 partitions. The external HD was unplugged and left unplugged. Since then, it appears on my desktop at every startup, ...
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2answers
209 views

Why my Mac Mini doesn't boot with external HDD attached?

Ext HDD is 3,5" 4TB WD RED (exFAT) in USB 2.0 box with external power supply (220v) When I restart my Mac Mini (late 2012, MacOS 10.14) in 90% the boot will end on black screen (no apple loading logo,...
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2answers
8k views

How to remove the use of master boot record from an external hard drive?

I have a 1TB external hard drive and I want to slice it into different partitions. When I try to do so, I get this error: can not modify external drive because it uses master boot record Is there ...
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2answers
546 views

How to completely stop “Disk Not Ejected Properly” message?

I use my MBP to charge my iPod and regularly unplug it without ejecting first - perhaps my laptop is asleep or I changed nothing... How can I stop this message? I'm aware of the reason for the ...
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27 views

how to transfer files from mac desktop to an external harddrive

I have files on the mac desktop that I want to transfer to a brand new external harddrive. I do not understand why it is not a straight forward matter. I am trying to drag the files I want to transfer ...
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2answers
297 views

External Hard Drive on Mac Won't Mount

I can't mount an external hard drive. I have tried booting into Safe-Mode, mounting via Disk Utility and running First Aid, which won't proceed due to the following error: diskutil eject disk1 ...
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0answers
427 views

Time Machine can't back up to an attached external USB drive

Mac "A" (iMac, macOS 10.14) has an attached USB hard disk "EXT" (3TB, GUID, macOS Extended, Journaled). Mac "A" can use Time Machine successfully to back up to external drives shared from other ...
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2answers
6k views

Slow write speeds with APFS encryped external SSD

I bought an external SSD with a USB 3.1 gen 2 enclosure. I'm on macOS 10.13.6 with a MBP (late 2013). Using APFS I get write speeds of around 390–405 MB/s. So far, so good. However formatting the ...
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3answers
2k views

Are Time Machine backups to an external disk attached to a Time Capsule supported?

My 1 TB Time Capsule drive is full with Time Machine backups. I'd rather spend $130 on a 3 TB drive than $500 on a new 3 TB Time Capsule. Is an external drive attached to a Time Capsule supported ...
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0answers
234 views

Not Admin | Firmware password error | Recovery Mode wont boot

This probably sounds pretty sketchy, so I’ll preface my question with a brief run down of how I got here... Pretty sure I was hacked... It’s a mid-2012 running High Sierra on a SSD harrdrive. ...
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256 views

Samsung X5 external SSD not recgonized

I'm having trouble getting macOS Mojave to recognize a Samsung X5 external SSD. When I plug the drive in, it lights up, but the OS doesn't seem to see it. I've plugged the drive into a Windows PC ...
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11answers
15k views

How to Eject All External Partitions Quickly?

I have an external disk with two partitions on it that I keep plugged into my MacBook Pro when I'm at my desk. (One is for Time Machine, the other just for extra storage.) Sometimes I need to grab my ...
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1answer
338 views

How to keep track of external hard drives?

I have about 7 external hard drives of varying capacities. From time to time, I move files from my MacBook onto those external drives and put Finder aliases where those files used to be. The process ...
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33 views

Unable to open Seagate HDD in MacBook Air running on macOS Mojave 10.14 (Using Paragon NTFS for Mac)

Please advise on how to open the HDD again. This previously worked fine and also HDD works on Windows 10. I am using Paragon NTFS for Mac to read the HDD.
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127 views

External hard drive not mounting

I have an external hard disk drive that's a few years old and lately it's been causing some issues. It started by unexpectedly unmounting, and a few days later it wouldn't mount at all. If I open Disk ...
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187 views

Certain files greyed out in external HDD

My question is the same as this one from 5 years ago. I have an NTFS external hard drive and certain files on it are greyed out and can't be opened until I run certain commands on the command line. ...
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0answers
238 views

Time Machine: Backups.backupdb uses way too much space when copied to another volume

I'm in the process of copying my TM backups to another volume. I followed these instructions: formatted the new volume, set the permissions, disabled automatic TM backup and dragged Backups.backupdb ...
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1answer
765 views

How to restore external hard drive from Time Machine backup the right way?

My Time Machine backup (6 TB USB-HDD) contains the data from my Mac's internal hard drive (2 TB) and from an external hard drive (USB 4 TB, Mac OS Extended, FileVault Encrypted) that I always keep ...
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0answers
116 views

Why is my iMac able to write to an NTFS external drive but not my MacBook Pro

My iMac (standalone desktop running Mojave) which is formatted as APFS is able to read and write to my Seagate external drive (which is formatted as NTFS). Yet my MacBook Pro (which was formatted as ...
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2answers
12k views

How do I download all iCloud Drive files to external hard drive?

Using Google Chrome, I am trying to download or copy + paste all of my files to an external hard drive so I can delete them afterwards and downgrade my iCloud drive subscription to something cheaper. ...
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42 views

Is there a way to go back to a previous state of an APFS Partition on an external drive?

My question sums it up. I would like to go back in time on a partition on an external drive which is formatted on APFS. Decrypting a VirtualBox image, VBox crashed (as it does all the time in Mojave) ...
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2answers
59 views

Why can't I copy a drive in full to another drive?

I am trying to copy one drive to another (both external) - from a 1TB to an empty 4TB drive. I reformatted the 4TB drive, and here is its information: $ sudo newfs_exfat -N /dev/disk3 Reformatting ...
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5answers
42k views

How can I write-protect (make read-only) a USB drive in OS X?

I have a USB drive with some archive data on it that I'd like to access from a Mac running Snow Leopard. However, I want to ensure that the data on the drive is preserved and no modifications are made ...
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0answers
415 views

OWC Envoy Pro Enclosure [with OEM SSD] MacOS Upgrade Problem

I have an Envoy Pro Enclosure (OWCMAU3ENPCIECS / OWCMAU3ENPRPCIU) [w/ OEM SSD - 512GB Mid-2015 Macbook Pro Retina SSD] that I use as a bootable external MacOS installation and it works fine. I have ...
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0answers
54 views

Mojave install failure “OSIInstallElement failed, Failure Reason: PKInstallErrorDomain:112”

I'm trying to install Mojave on a brand new 2TB Western Digital external hard drive. I've formatted the drive as APFS. The installer gets partway through, and then fails with macOS could not be ...
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2answers
1k views

External disk is hijacked by fsck when plugged in to Macbook

External disk (2 TB Seagate) is captured by fsck when plugged into a USB 3.0 port on my Macbook Pro (macOS Mojave 10.14.5). This has been discussed by @ArielAllon, and indeed, when I kill the fsck ...
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1answer
41 views

Nano Memory card does not show up in Finder nor Disk Utility

I have a Nano Memory card working fine. I know it's fine because it contains a bootable ubuntu OS that is being used in a Raspberry Pi. When I plug it to my Macbook Pro (Mojave 10.14.5) it does not ...
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1answer
284 views

Why does unplugging a drive lead to data loss when moving files?

I did a cut and paste (Comd+C then Comd+Opt+V) on my Mac 10.14’s Finder to move some .mov files from my internal SSD to my WD My Passport External Harddrive. Alas, after a while, I move my Macbook ...
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1answer
2k views

Disk ejected but still show up in Disk Utility?

I have this external (USB) drive that can't seem to be disconnected correctly. Whenever I eject the drive, it won't disappear from Disk Utility. Afterwards when the drive gets re-connected again, it ...
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1answer
36 views

A WD hard drive can be detected by one Macbook but not another

A WD My Passport hard drive (bought in 2016-7) can be detected by one Macbook (a 2018 15" MacBook Pro) but not another (not even in diskutil) (a 2013 11" Macbook Air). What is the explanation for this?...
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0answers
546 views

Sharing and Permissions - always shows “Fetching” instead of the user name

I am a basic Mac user, so please bear with me. I have a WD MyCloud EX2 to store large files and videos - over 10000 files, so searching is critical for me. The WD NAS, the iMac are connected via ...
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0answers
117 views

Why is my external hard-drive is not appearing (most of the time)

I recently bought an external hard-drive, Western Digital 4GB, and I have a MacBook-pro 2015 (15inch). When I received the hard-drive, it worked like a dream, I just re-formatted it to apple's file ...
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1answer
557 views

Cannot install macOS Mojave on external spinning drive. Error: This Mac can only install macOS on APFS-formatted drives

I am using the Install macOS Mojave.app installer on my Mac mini (2018) running Mojave 10.14.5 to install Mojave on a formatted external spinning disk laptop drive (a Toshiba model with case). I ...
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2answers
2k views

Tool to objectively test performance various external drives on my Mac via USB & Thunderbolt

I would to test the relative performance of various external storage devices: Thumb drive Samsung MUF-256AB/AM FIT Plus 256GB - 300MB/s USB 3.1 Flash Drive (256 gigs) Spinning metal drive Toshiba ...
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1answer
148 views

Partition external SSD (Win10 already installed) for Mac

My situation: I successfully installed Windows 10 on a Samsung T5 external SSD (size of 1TB) which I can boot into using my MacBook Pro 13" (2017 model w/ 4 Thunderbolt 3 ports). Under Windows, the ...
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3answers
824 views

Why is my external HDD active when I'm not using it?

I have a partitioned external HDD (orange LaCie), with one partition for Time Machine. All partitions are Mac OS Extended (Journaled, Encrypted). The HDD is GUID Partition Map. I'm not (consciously) ...
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1answer
338 views

External HD (Time Machine) sleep issues

I have a 4TB WD external hard drive with three partitions on it, one being a Time Machine partition. When a Time Machine backup is running and the computer goes to sleep, it triggers a few different ...
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1answer
108 views

Strange situation in making backup on an external disk

As the screenshot above shows, tonight, while trying to make a backup of the files on my Mac OS X, Version 10.7.5, Processor 2.4GHz Intel core i5, Memory 4 GB 1333 MHz DDR3 laptop computer, I got this ...

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