Let’s say you’ve encountered the problem of SSD not showing up. Possible reasons why your Mac does not recognize external hard drive Let’s take a look at why this is happening and how you can fix the external hard drive not showing up problem. And besides, there can be a risk that data on the external USB pen, hard, or flash drive is corrupt, which means you can’t transfer what you need between devices at all.Ĭorrupt data can be one reason your Mac won't recognize an external drive, but there are other reasons too. It’s annoying, especially when you need to transfer something right then. However, sometimes, an external hard drive doesn't show up. Apple likes to ensure these are easy to find, so they also appear in the Finder in the left-hand column under Locations. Most of the time, when you connect an external hard drive to your Mac’s USB port, you soon see it mount on the desktop. Is there a way to change the partition table and the format of my disk without losing any data? The absurd situation is that I have no space to save those archives on my Mac to create a back-up copy of them.Get an ever-growing collection of troubleshooting apps. Is there a way to change the partition table and the format of my disk without losing any data? The absurd situation is that I have no space to save those archives on my Mac to create a back-up copy of them. I suspect that might be the reason I behind the incredible slowness of the mounting process.

While using Disk Utility this week, I noticed that the partition table in the Toshiba HDD is MBR instead of GUID. If the golden hard drive disk icon appears at the end of the tedious process, there's more waiting to do, as reading the folders seems to take ages. However, it can take up to 60 minutes to mount when I connect it to my MacBook Air. Disk is always mounted in several seconds, no more than 10. It works like a charm, flawlessly, when connected to any PC, whether cheap and disposable to state-of-the-art.

The HDD is formatted using the exFAT file system.

There are almost 700 GB of important data saved into it.

It is brand new, in perfect physical state and was bought at a perfectly reputable store. I own a 2 TB Toshiba Canvio external hard drive, from their Basics line.

Mac air hard drive