I can see it using the Terminal and have ejected it like you said, however even though it says ejected, and the light on the hard drive turns off, it is still. It won’t mount using disk utility. Recently updated to high sierra on an old mac, (yes I am that behind with updates), now it won’t let me access a Samsung Hard drive i used to use.You should also take basic steps to ensure you can recover from any install issues you may come across.Long before I attempted the migration, I did replace 32-bit apps and Kexts with 64-bits capable software. Even so, it’s a good idea to review our Rocket Yard guides for a clean install of macOS Catalina as well as an upgrade install of Catalina. Your Mac should begin to use the new External disk to boot from.Installing a new version of the Mac OS is generally a fairly pain-free process this trend continues with macOS Catalina.The lone exception is the 2010-2012 Mac Pro, whose graphics cards don’t meet Catalina requirements. It may be that the installation won’t start, it seems to freeze during the installation, or it never seems to complete.The two primary causes are attempting to install on a Mac that Catalina doesn’t support, or trying to install Catalina on a Mac with limited storage space.Supported Macs: Most Macs from 2012 or later support macOS Catalina. If it does get your Mac going again, remember to back up your Mac before you go any further.If you need a storage solution to handle your backups, Other World Computing has a large selection of storage options you can choose from.With backups out of the way, let’s take a look at some of the common and not-so-common macOS Catalina installation issues you may run into: macOS Catalina Won’t InstallThis is the most basic of Catalina installation errors it simply won’t install. Not Mounting on Mac (Monterey, Catalina, Big Sur) When your external hard.The most important of these is to back up your Mac before you start the installation process so that you can recover from any installation issues that may arise.If you’ve run into an issue and you didn’t first perform a backup, then with any luck, one of our tips will get you back on track. I have been a VMware user for a long time, so I had to install apps that I don’t want to lose into suitable VMs this is a project by itself.macOS Catalina, Mojave, High Sierra, and Sierra (and Mac OS X El Capitan).
High Sierra Takes Long Time For External Hd To Mount Download The MacOSI normally suggest a good deal more free space than that, but here we’re just talking about a minimum to ensure you can install and use macOS Catalina.If you’re performing an upgrade install, you need to make sure the startup drive has enough free space for the installer download (6.5 GB), as well as room for the files the installer will copy to the startup drive during installation. As if that weren’t enough, you should keep at least 10 to15 percent of the startup drive free to ensure adequate performance. In addition, you need to allow for space for your user data, applications, and future updates. After that, the amount of space needed is dependent on the type of installation you’re performing: a clean install or an upgrade install.You can see how much free space is available on the target drive by highlighting the drive and pressing Command-IA clean install uses up around 20 GB of storage space. A Complete List of Catalina Compatible MacsStorage Space: You’ll need about 6.5 GB of space just to download the macOS Catalina installer.Running Low on Mac Storage? Here Are 5 Tips to Recover Some SpaceFor some of us, even after we clean out unneeded files we’re still short on free space and need to consider upgrading our Mac’s internal drive or adding an external storage system. The Files That Make Up the ‘Other’ Storage Category, and How to Remove Them Tech 101: How to Quickly Free Up Mac Storage Space But if you have 25 GB of free space available, you should be able to successfully perform an install of Catalina.If you’re tight on free space, consider removing unneeded files using one of these methods: First Aid: Verify and Repair HFS+, APFS Drives with Disk UtilityCould Not Create a Preboot Volume for APFSThe “could not create preboot volume” along with other APFS (Apple File System) errors associated with converting an HFS+ drive to APFS are rarely encountered, an indication of the maturing of the APFS file system.MacOS Catalina requires the use of APFS instead of HFS+. You can find instructions on using First Aid in: You should also run First Aid on the startup drive if it isn’t the target for the installation. If you haven’t already done so, you may want to run Disk Utility’s First Aid tool to check and repair the target drive. The simple solution is to delete the macOS Catalina installer and download a new copy.Disk Utility’s First Aid should be run to ensure the startup drive and the target drive do not have any issues that could impact installing macOS Catalina.A new installer will usually take care of the issue, but there’s another problem that could lead to the same message: a damaged target drive for the installation. Upgrades Guaranteed to Work With Your MacThis message (or a variant) will sometimes show up just after you start the installation process, and is most often caused by a corrupt installer file. Everything You Need to Know About OS X RecoveryActivation Lock Prevents Access to Your MacOne of the features of newer Macs is the incorporation of T2 Security Chips, which provide a number of useful features, one of which is the ability to erase and deactivate your Mac if it is stolen.The Find My app (here shown on an iOS device) can be used to fix an unexpected activation lock on your Mac.During beta testing, a few people reported that Catalina was failing to complete the installation because it believed the Mac had the activation lock set as if it had been reported stolen. If this happens to you, you’ll need to use the Mac’s Recovery utility to repair the startup drive using Disk Utility, and/or reinstall the Mac OS or use your backups to recover from.You can find instructions for using the Recovery utility in the Rocket Yard guide: This fixes the issue for most users experiencing this problem.Unfortunately, it’s possible that if the installer hangs up at the worst possible spot, your Mac may not be able to restart because of startup drive issues. Installation Freezes or Failure to CompleteThese are actually two issues the first is the installer freezing during the first phase of the installation process, and the second is when the failure to complete happens after your Mac has rebooted and attempts to load Catalina for the very first time.In both cases, the first thing to try is to restart your Mac. The best way to ensure that this isn’t a Date & Time issue is to use the option to “Set date and time automatically.” You’ll find this option in the Date & Time tab of the Date & Time preference pane. Make sure you have both the correct time and the current date properly configured. How to download windows emulator for macThe T2 chip protects your Mac by default from being booted from an external device. Unable to Install Catalina on an External DriveThis issue can occur because of the T2 Security Chip found in recent vintage Macs. Log in to your iCloud account, if needed, then remove the Mac in question from being associated with your Apple ID.This should allow you to restart the Mac and complete the Catalina installation. In actuality, the clean install was performed, the Mac is just booting from the wrong startup device.The fix is to open the Startup Disk preference pane and set the startup disk correctly for your Mac.Reset NVRAM and SMC: The NVRAM and SMC hold information used by your Mac during startup. It may also choose the wrong device to boot from, leaving you wondering what’s going on.Use the Startup Disk preference pane to ensure your Mac is starting from the correct disk.This behavior can explain one problem I’ve seen reported: a Mac that seems to complete a clean install but when the Mac finally reboots, it’s back to the original version of the OS, with no changes. In the case of not being set, your Mac may take a very long time to start up as it searches for a device to use to start up from. Everything You Need to Know About the Apple T2 Security Chip Startup Security UtilityIf the install issue you’re having isn’t covered in this guide there are always a few general-purpose tips that may help resolve the problem:Startup Disk: Occasionally, the startup disk isn’t set or is set incorrectly.
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