Questions tagged [external-disk]

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

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APFS vs Mac OS Extended (Journaled) for Time Machine Backup on external HDD

Which one between APFS and Mac OS Extended (Journaled) performs better as partition store type for Time Machine backup in an external HDD (Magnetic Storage over USB connectivity)?
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APFS vs Mac OS Extended (Journaled) for external HDD

Which one between APFS and Mac OS Extended (Journaled) works better as partition store type for an external HDD (Magnetic Storage) that will be accessed over USB from macOS only?
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1answer
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Cannot partition external drive

I have an external drive that I just cannot partition. It's blank, so i have used Disk Utility and diskutil to erase, verify,repair etc., but nothing works. It gives me this sort of thing: Error: -...
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1answer
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Actual working tutorial of installing catalina on an external drive?

I want to know where the working tutorial for installing Catalina on an external drive is. All the tutorial I managed to google up for some reason failed to mention the "missing a firmware ...
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1answer
22 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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Eject on menu bar shows “No Drives” even though an external drive is connected

I have an external drive connected to my mac and I'm able to eject it from the finder window or the desktop like usual. Finder: Desktop: But, I would like to be able to eject it from a menu bar icon....
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1answer
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Mount and repair disk not recognized (Timed out waiting)

I’ve a 525 GB Crucial SSD that I can’t mount. It appears only greyed out on Disk Utility but not in Finder or Desktop. Here's the disk description by diskutil list /dev/disk2 (external, physical): #...
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13 views

Is there a way to store podcasts on a separate drive in Catalina?

I just got a new Macbook Pro running Catalina, to replace an older Macbook running Mojave. I used Migration Assistant to move my old user account over to the new machine from a Time Machine backup ...
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1answer
39 views

Cannot find old Notes data

I just upgraded my harddrive for my Macbook Pro mid-2009 running High Sierra to a solid state drive. My old harddrive is now in an enclosure and I'm trying to access my old Notes from there, I forgot ...
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Changing temporary file location from Mac to external hard drive using terminal

I am using a Backup Extractor app to extract photos/media from a recent backup on my external hard drive. I successfully extracted photos from the backup and saved it to my external hard drive. Now I ...
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3answers
5k views

New WD External Drive Can't Eject & Files Won't Display on MacOS

I cannot see the files or folders on this external hard drive and I am unable to eject the drive. I must not lose this footage. The drive is a brand new WD My Passport 25E1 Media 2TB External Hard ...
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External USB powered DVD writer doesn’t power up using macOS Catalina when using direct USB C to mini USB cable

I have owned three different models of the new MacBook Airs (2018, 2019 and 2020) running macOS Mojave (10.14) and macOS Catalina (10.15) and noticed a strange issue today when connecting a USB ...
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2answers
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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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4answers
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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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WD external USB disks intermittently showing

OS = Catalina System = iMac 2013 Problem Disks = WD Passport 4TB X 2 Some days you plug in the disks all folders and files shows up. Next day you might connect both disks - nothing shows up. This ...
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1answer
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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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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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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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4answers
42k views

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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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
62 views

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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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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5answers
97k views

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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2answers
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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
628 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
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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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0answers
14 views

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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5answers
44k views

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
192 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
47k 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
239 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
6k views

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
37 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
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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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0answers
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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
25 views

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
735 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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0answers
62 views

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
46 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
29 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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0answers
94 views

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
100k 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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0answers
33 views

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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0answers
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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