Questions tagged [external-disk]

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

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9 views

Resize Windows NTFS partition using space from macOS partition

I would like to take 50 GB of Mac_drive and move it to the drive Photos_Backup. Is there any way I can do this? I would like to not wipe or delete the drive and keep all of the data on Photos_backup.
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External drive with OS X 10.13.2 will not boot from USB 3.0 enclosure

I'm cutting and pasting from Apple's Community support site where I posted this issue today, rather than type it again, since the details are dense: My system, prior to 12/20/2017 was a MacBookPro9.2 ...
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1answer
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Installing Ubuntu 20.04 on external drive with iMac running macOS + Windows 10

I have a late 2012 iMac running macOS High Sierra (10.13.6) and Windows 10 (Build 18362) through Bootcamp in legacy BIOS mode and I'd like to do a full install of Ubuntu 20.04 to this external drive ...
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Reformat Time Machine backup drive back to an ordinary external hard drive

I have a WDC Passport external drive which I used as a time machine backup. However, I do not want to use it as Time Machine backup anymore, I just want to use it as a regular external hard drive. ...
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Restoring iPhone Backup from External Hard Drive

I had recently organised all the storage on my Mac and was finally able to back up my MAC and my iPhone. In order to create more space, I found an article online which told me how to move the back up ...
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1answer
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External NVMe Sabrent SSD not recognised by Catalina Macbook Pro 16" over USB-C, only USB-A

I recently bought a 2TB SSD hard drive, placed it in a USB 3.1 enclosure and formatted it to Mac OS Extended (Encrypted). I began to do a straight copy from another SSD (Sata), both connected via USB-...
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1answer
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How to reformat hdd only viewable under (About Mac) -> (System Report) -> (USB 3.0 Bus)?

After changing to a new external USB hdd for Time Machine my previous external USB drive used for Time Machine (almost) disappeared. My old drive is a Western Digital, My Passport 25E3 for Mac (1-tb). ...
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2answers
37 views

Why is my external HDD failing to mount on my MacBook?

All of my MacBook Pro 13" 2017 backups are kept on my Toshiba External HDD. I decided to update my MacBook to macOS Big Sur developer beta (because I am a dev) and test it out. I backed my ...
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1answer
19 views

External WD Drive showing read only

I have WD External SSD Drive and macOS Catalina. The drive is formatted in ExFAT Initially, I used my external drive 2-3 times and it was working fine. Suddenly today I am not able to write anything ...
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1answer
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Is there a Recovery Key for encrypted external drives?

When you encrypt your startup disk with FileVault, macOS gives you a recovery key. Does macOS also create one for external drives? If not, would it be possible to make it create one?
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Problem after moving iTunes libraries between NAS drives

Brief Summary of Problem Transfer of an iTunes music library from an old NAS drive to a new one resulted in message of the type “unable to connect to old NAS drive address” when trying to play music ...
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Formatting USB Disk As EXT3 On Mac

How can I format a USB disk as ext3 using OS X Yosemite? I want to use it on another system that is linux based but I wish to format it first before connecting to the linux system.
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Is there an app (like Spotlight) that can index external drives and return search results when the drive is not connected?

I have multiple external drives, some with photo, app and video resources, some with client files and some with backup data dating back to 1988. I also have a number of BluRay backup disks with raw ...
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1answer
2k views

Can't boot from external APFS formatted SSD

I have a Mac mini with macOS High Sierra and an external SSD drive connected via USB also with High Sierra on it. After converting the external SSD to APFS it doesn't boot anymore - my Mac can't see ...
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4answers
568 views

Why does Apple not recommend storing your iMovie library on an external drive?

I want to try keeping my iMovie library on an external drive because I use both my Imac (at home) and my MBP (when traveling) to edit my videos. Ideally, I would like to use a SD card so that it ...
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1answer
35 views

Macbook Pro 17" mid 2010 + NEC upd720202 Express Card USB 3.0

I have a MacBookPro6,1 running well and stable on MacOS 10.9.5, I use it for video image editing, so I have a lot of data on external drives. Recently found out that I can speed up all transferings ...
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Time Machine backup of an external drive (to another external drive)

I back up my internal drive to an external backup drive using Time Machine. I would also like to back up a 1TB external drive of mine, to another 1TB external drive of mine. Is it possible to make ...
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USB Flash drive not mounting OS X

Some months ago I bought a USB flash drive 16 GB, and I have used it on my Windows machine with no errors or bugs, whatsoever. Since that I need to move some files from my Mac, the flash drive does ...
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Are my external disks fried? Can they be salvaged, formatted or partitioned back to Exfat?

TL;DR I have two brand new 2TB JMicron Generic Media external 2.5" HDDs and one old 128MB flash drive. All three were usable (they've been used for transferring files, not Time Machine). Now both the ...
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1answer
175 views

Unusable 2.5" external HDD. Partition failed with the error -69760: Unable to write to the last block of the device. Exfat only? Repairable?

Update 1: Somehow, after unconnecting and re-connecting, the original disk (disk1) has now returned to original state, with the readme file as well! I still have another disk which is not working. ...
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4answers
46k views

macOS: Can't mount exFAT External Drive

I have a Western Digital MyBook (25EE) 8TB External Drive. It is formatted with exFAT. I can't recall exactly how it was formatted, but I believe it was done with Synology's DiskStation for my ...
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2answers
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Trying to erase disk

So i'm trying to erase the disk after making it to a bootable usb but now im getting this error "Couldn't open device" I've tried researching and tried every method but the usb won't erased. I've ...
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2answers
234 views

Would a powered USB hub solve the problem of two external disks randomly losing connection or being slow?

I have an older MacBook (circa 2012) and I have two external drives. I want to merge the content of the two drives but Finder is having fits with it. It will lose the connection to the drives at ...
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4answers
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Prevent Spotlight from indexing external drive

Sometimes I use an external drive with macOS on it. This is in conjunction to my current internal drive which also is running macOS. I find it annoying that, whenever I search for something (such as ...
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1answer
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External drive's files not showing, but I know it has been half-filled with data. It works fine on Ubuntu but not on macOS?

My external hard drive used to work just fine (my OS is Mojave) - I can read and write because I used NTFS Paragon software free trial. But now that I wiped all traces of said software, my external ...
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1answer
35 views

Hard drive in external enclosure won't mount

I'm trying to retrieve data from an old MacBook. I've removed the hard drive, put it into an external enclosure, and connected it to my current MacBook. This is the structure of the drive in Disk ...
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1answer
23 views

Seagate external hard drive won't mount

my external hard drive worked fine last week. I cannot get it to mount or show up. here is what it looks like, and here is what i have tried. First aid does nothing, mount does nothing. I have tried ...
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Different Free Storage Amounts on External SSD

This has really confused me. I recently bought an 1024 GB External SSD for my Mac mini, and put about 200 GB of files on it. However, whenever I click the space bar to see how much storage is left, it ...
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1answer
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I can't boot into macOS Mojave on a Catalina laptop

I have Mojave 10.14.6 on an external drive. When I plug it into my T2 MacBook Pro 16 inch running Catalina I get the prohibitory symbol instead of the Apple symbol and it can't boot. Is this issue ...
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1answer
30 views

Why does my Mac not see my external drive as a boot option unless connected via an Apple-branded dongle

I'm running into this odd issue where my external drive (Windows 10, Bootcamp) will only appear as a boot option if connected via the Apple dongle, and not via my regular off-brand dock/dongle. Odd ...
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3answers
699 views

Can't unmount external disk used with Music app due to AMPLibraryAgent process

I use an external storage disk for my Music library in macOS 10.15 Catalina, because the required file size is several times my internal SSD. After upgrading to Catalina, now when I connect the drive ...
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Are cheap 2.5" external hard disks constrained to Exfat and incompatible with Time Machine? Is this a physical limitation / hardware issue?

I bought two 2TB 2.5" external HDDs that came with the following warning message in a Readme file contained in the drives. "The drive can only be formatted with Exfat and cannot be formatted in other ...
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1answer
40 views

Formatting an External SSD for Mac

I know this seems like a basic question, but I’ve looked around online a bit and found different answers to this. I’m getting an external SSD for my 2018 Mac mini, and I’m using it to store music ...
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2answers
24 views

No security options for external hard disk erase in Disk Utility

I'm trying to erase an external disk drive that I had been using as a backup disk. There are no options for me to securely erase - the option just isn't there at all. It is currently formatted as MAC ...
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How to Install High Sierra on External Drive

I'll try to keep this as simple as possible but it's a little complicated. I am trying to install High Sierra on an external disk. The computer I'm using is running Mojave, however, so it won't run ...
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7answers
99k views

What is the best way to clone a disk between two Macs?

What is the best way to clone a disk between two Macs? I ask this every couple years or so and every time I get the same answer. "Use Carbon Copy Cloner", they say. But the unfortunate fact is that ...
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External HD: Partition map check failed because no slices were found. (-69770)

I can't access my external HD. This is the error that I get when trying to run first aid in disk utility: Running First Aid on “WD My Passport 25E2 Media” (disk2) Checking prerequisites Checking ...
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38 views

Seemingly unprovoked software corruption on external drive. Can I salvage?

I have an external disk on my Mojave system that seemingly had the volume name overwritten with another volume's name and now it won't mount and Disk Utility firstaid won't help. I have an external ...
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10answers
144k views

How to eject my external drive when my Mac refuses because of Spotlight?

I have plugged an external disk to my Mac. Now, I want to eject it. But my Mac stubbornly refuses and says that an application may be using the disk. I have not launched any app neither opened any ...
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2answers
34 views

External SSD drive fails to respond after some frequent writes

I am using a Sandisk SSD. It has happened a few times already in last two days. After some frequent writes, suddenly I will have trouble accessing the drive. In the latest occurance, I did not read ...
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1answer
68 views

Is there a way to make an iMac's internal drive disappear completely WITHOUT removing it?

I want to make it so that it can't be seen or written to while booted from an external drive. For some background, I use a cross-platform dev environment that can target Linux and want to install the ...
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1answer
27 views

Very slow Intel 660p 2 TB M.2 in Icybox enclosure

So, i´ve installed an Intel 660p 2 TB M.2 drive into this enclosure. The speed has been good for a while, but it seemed to slow down a lot when i had about 150 GB left on the drive. Speed is down to ...
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3answers
6k views

APFS on external drive missing from Disk Utility

When I use Disk Utility app in macOS Mojave to format an external drive, I do not see the new Apple File System (APFS) offered as a choice of format. Does it matter that my external drive is a ...
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33 views

Under Catalina, should I use HFS+ or APFS when symlinking media folders to external drive

As I'm planning to install an SSD into my iMac with smaller capacity than the internal Fusion Drive its replacing, I will need to symlink my Movies, Music and Pictures folders to an external mains ...
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9 views

Is a sparsebundle backup incompatible with making a direct backup at a later date?

I had a backup system set up several years for my desktop Mac and MBP using Time Machine and 2 Seagate portable drives directly attached to the desktop with the MBP backing up wirelessly. So I ended ...
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1answer
16 views

Cannot access external drive [duplicate]

I have a seagate 2013 or 2014 external hard drive which has been working fine up until yesterday. The drive wont appear anywhere on my mac- not on desktop, finder, disk utility wont ever finish ...
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18 views

🚫when booting from usb drive

I have a boot hard drive from an old Mac and a new Mac. I want to boot the new Mac from the old Mac's boot disk (preferably without having to take the new Mac appart) So I attach it via USB, ...
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0answers
90 views

Apple iPad USB stick showing “External: open dir error, path = / ”

Greetings dear community. I bought a 128 USB stick for my Gilrfriend's Mac which works solely with an app called LUV-Share. The USB was brand new and was supposed to store HD movies, which are above ...
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0answers
44 views

Folder on external, NTFS formated, drive empty after mounty and fstab changes

I have Mojave installed on Mac and an external NTFS formatted hard drive. a) tried to get writing permission via the terminal sudo nano /etc/fstab LABEL=NAME none ntfs rw,auto,nobrowse b) installed ...
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0answers
19 views

External SSD not visible to MacPro

Strange one this. I have a new bare SSD I'm trying to add to my system. When installed in the enclosure I have set aside for this drive it will not show up on my system. To confirm the enclosure is ...

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