When a portable SSD won't show up, the drive itself is rarely broken. Nine times out of ten the problem is the cable, the port, the power supply or the way the drive is formatted, and none of those put your files at risk.
Start with the table below to work out which one you're dealing with. Then jump to the section for your Windows PC, Mac or iPhone.
The 4 Usual Causes
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Cause
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What you see
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Try this first
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Cable
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Nothing happens, or the drive light comes on but nothing appears
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Use the cable that came with the SSD, or another data rated USB C cable
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Port
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Works on one computer but not another, or only in some ports
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Plug straight into a port on the computer, not a hub or a front panel socket
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Power
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Drive connects, then drops off, or only fails on a phone or hub
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Remove the hub, shorten the chain, try a powered hub
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Format
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Drive works on one system but is invisible or read only on another
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Check the file system; exFAT works on Windows, Mac and iPhone
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The cable is the one people overlook most. Plenty of USB C cables that come with phone chargers only carry power, so the SSD gets enough to light up but never sends any data. If your drive came with a short cable, that's the one to try first.
Fix an External SSD Not Showing Up on Windows
Check Disk Management
Right click Start and open Disk Management. This shows every drive Windows can detect, including ones File Explorer is hiding. For one to see the disk that matches the size of the SSD in question, he/she should look at the lower half. For any that shows offline, right-click on the grey icon and select online. If unallocated is indicated, then there is no partition on the drive, meaning the drive could be either a new one or one that was just formatted.
Give It a Drive Letter
The other thing that can happen is that the SSD will show up fine but without a drive letter. When this happens, you right-click on the volume and select Change Drive Letter and Paths. Then click on Add and use an available letter.
Reinstall the Drivers
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Open Device Manager by right clicking Start.
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Expand Disk drives, right click your SSD and choose Uninstall device.
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Unplug the SSD, wait ten seconds and plug it back in, and Windows reinstalls the driver on its own.
If the drive keeps dropping off after a few minutes, Windows may be cutting power to the USB port to save battery. Search for Edit power plan, open Change advanced power settings, and under USB settings set USB selective suspend to Disabled.
A Drive Formatted on a Mac
It is impossible for Windows to work with APFS and Mac OS Extended file system types. If a drive was formatted using a Mac, then it may be listed in Disk Management as an unidentified partition but will not appear in File Explorer, and there will be an option to format it using Windows. Do not do that unless you have an empty drive.
Fix an External SSD Not Showing Up on a Mac
Check Finder Settings
A Mac sometimes hides external drives from view even when they're working perfectly. In Finder, open Finder > Settings. On the General tab, tick External disks so drives appear on the desktop, then on the Sidebar tab tick External disks under Locations.
Mount It in Disk Utility
Open Disk Utility from Applications > Utilities and click View > Show All Devices. If your SSD is listed but its volume looks greyed out, it isn't mounted. Select the volume and click Mount in the toolbar. A drive that doesn't appear in Disk Utility at all points back to the cable, the port or power.
Unlock an Encrypted Drive
Drives formatted as APFS (Encrypted) won't mount until you enter the password, and if you clicked away from that prompt, the drive just sits there unmounted. In Disk Utility, select the volume and click Mount, and the password box will come back up. Without the password, there's no way into the data, so keep it in your password manager.
Run First Aid
If the drive mounts but won't open properly, select it in Disk Utility and run First Aid to repair file system errors. One more thing to know is that a Mac can read NTFS drives but can't write to them, so an SSD formatted on a Windows PC will show up but refuse new files.
Fix an External SSD Not Showing Up on iPhone
More and more people plug an SSD straight into their iPhone to shoot video or clear space, and the iPhone has its own set of quirks. These are the three things that trip people up most often.
It Doesn't Appear in the Files App
Open Files, tap Browse at the bottom, and look under Locations. The SSD should be listed there by name. If it isn't, unplug it, wait a few seconds and plug it back in, then close and reopen Files. iPhone 15 and later models have USB C and connect directly. Older iPhones with a Lightning port need Apple's Lightning to USB 3 Camera Adapter, with a charger plugged into the adapter.
The Format Isn't Supported
An iPhone reads drives formatted as exFAT, APFS and FAT32, but an SSD formatted as NTFS on a Windows PC usually won't work properly. The simple fix is to back the drive up and reformat it as exFAT on a computer, since exFAT also works on Windows and Mac. Recent versions of iOS can erase a drive from the Files app too, if you touch and hold it in Locations. Apple's guide to external storage on iPhone lists the steps for your iOS version.
The Phone Can't Supply Enough Power
A phone sends far less power down its port than a laptop does. Most portable SSDs are designed with that in mind, but long cables, cheap hubs and adapters chained together can drop the power low enough that the drive disconnects halfway through a transfer. Connect the SSD directly with a short cable, and if the phone's battery is very low, charge it first.
Drives designed around the iPhone avoid most of these problems. The Digiera Endura Ultra Thin MagSafe Portable SSD snaps onto the back of a MagSafe iPhone with a short cable built for it, and the Digiera Portable SSD plugs into any USB C phone, tablet or laptop.
When to Format, and When to Replace
Formatting clears up most format and file system problems, but it erases everything, so it should always come after you've copied your files somewhere else. If the SSD moves between Windows, Mac and iPhone, choose exFAT. If it only ever connects to Apple devices, APFS is fine.
It's time to replace the drive when you see any of these signs:
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No computer, phone or cable can detect it at all.
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It disconnects during large transfers on every device you try.
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It gets very hot within a few minutes and then drops off.
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The case is cracked or the USB C port on the drive feels loose.
If you need a replacement, you can compare sizes and speeds across Digiera's portable SSDs.
FAQs
Why is my external SSD not showing up?
In most cases it comes down to a charge only cable, a hub or front port that isn't passing data, too little power, or a format the device can't read. Try the original cable in a port directly on the computer before anything else.
Why does my external SSD show in Disk Management but not File Explorer?
The drive is usually missing a drive letter, or it's formatted in a way Windows can't read, such as APFS from a Mac. Assign a letter in Disk Management, and if it shows as an unknown partition, copy the files off on a Mac and reformat it as exFAT.
What makes the external SSD not show up on my Mac?
If Finder is just hiding the external drives, enable them via Finder preferences. If that doesn’t make your drive visible, open Disk Utility, select Show All Devices, and mount it there using the password if it is encrypted.
Why won't my iPhone read my external SSD?
The most common reasons are an NTFS format, a weak cable or hub, and an older iPhone without the right adapter. Reformat the drive as exFAT, connect it directly with a short cable, and check it under Browse and Locations in the Files app.
What format should be used for an external SSD for Windows, Mac and iPhone?
The exFAT format is preferred when the drive is moved around in all three operating systems as each of them supports reading and writing to this format. The APFS format should be used if the SSD will work only with the Mac or iPhone.
Can a bad cable stop an SSD from showing up?
It can, and it happens often. Many USB C cables only carry power, and worn cables can lose their data connection while still lighting up the drive, so swapping the cable is one of the first things to try.
