Yes. Every iPhone running iOS 13 or later can read and write a USB drive — flash drives, portable SSDs, hard drives, and SD card readers — through the built-in Files app. No computer, no special app, no jailbreak.
What you need depends on which iPhone you have, and there are a few details that decide whether the drive works smoothly or not at all: the cable, the drive's format, and how much power it needs. Here's all of it.
Which cable or adapter do you need?
iPhone 15 and later have a USB-C port. A USB-C flash drive or SSD plugs straight in, or connects with an ordinary USB-C cable. A drive with the older, rectangular USB-A plug needs a small USB-C to USB-A adapter.
iPhone 14 and earlier have a Lightning port and need an adapter. Apple makes two:
- Lightning to USB Camera Adapter — a basic adapter for low-power drives.
- Lightning to USB 3 Camera Adapter — adds a second Lightning port so you can plug in a charger at the same time. This matters for drives that need more power than the iPhone supplies.
You'll also find flash drives with a Lightning connector built in. Some of these only work through their maker's own app rather than the Files app, so check before you buy.
Which drive formats work?
| Format | iPhone support | Notes |
|---|---|---|
| exFAT | Read and write | Best choice. Works on iPhone, Android, Windows, and Mac. No practical file size limit. |
| FAT32 | Read and write | Can't store any single file over 4 GB — long 4K videos fail. |
| APFS | Read and write | Apple's format. Great on Apple devices, but Windows can't read it without extra software. |
| HFS+ | Read and write | Older Mac format, same caveat as APFS. |
| NTFS | Typically read only | Common on drives used with Windows. The iPhone can open files but not save to it. |
If a drive shows up but won't let you save anything, it's very likely NTFS. If small files copy but a long video fails, it's FAT32. Recent versions of iOS can erase and reformat a drive from the Files app — long-press the drive and look for an erase option — but erasing deletes everything on it, so copy anything you need off first.
How to connect a drive
- Plug the drive into your iPhone, using an adapter if needed.
- Open the Files app.
- Tap Browse. The drive appears under Locations with its name.
- Tap it to see its contents.
When you're done, make sure any copy has finished before unplugging. Disconnecting a drive in the middle of a write can damage files or the drive's folder structure.
What can you do with a USB drive on an iPhone?
More than most people expect:
- Browse, copy, move, and rename files and folders, and create new folders.
- Open documents — PDFs, text files, and Office documents preview directly from the drive.
- Play video and music stored on the drive.
- Compress and uncompress files, including opening ZIP files.
- Save photos and videos from the drive into your photo library: select them in Files, tap Share, and choose to save them.
- Save files from other apps — email attachments, downloads — straight to the drive.
- Record video to it. On Pro models starting with the iPhone 15 Pro, the Camera app can record ProRes video directly to a connected external drive.
- Import from camera cards. When you connect an SD card or drive with camera-style folders, the Photos app may offer to import from it directly.
What you can't do
- You can't back up the whole iPhone to it. iOS doesn't offer a full device backup — apps, settings, and messages — to an external drive. That still requires a Mac or PC, or iCloud Backup. How to back up an iPhone without a Mac or PC explains how to cover everything.
- You can't move your photo library onto it. The Photos library always lives on the iPhone's internal storage.
- You can't install or run apps from it. It's storage for files, not an extension of the phone's own storage.
Does speed depend on the iPhone?
Yes. Pro models starting with the iPhone 15 Pro support USB 3 speeds when used with a USB 3 cable. Other models transfer at USB 2 speeds, and the cable that comes in the box has typically been a USB 2 cable even with Pro models.
The drive matters too. A portable SSD is generally much faster than a basic flash drive, which is noticeable when copying a large photo library.
Troubleshooting: the drive won't show up
Check power first. An iPhone supplies limited power through its port. Portable hard drives and some larger SSDs need more than that, so the drive may not appear, may appear and then disconnect, or iOS may show a message that the accessory needs too much power. Use the Lightning to USB 3 adapter with a charger connected, a powered USB hub, or a drive with its own power supply.
Try another cable or adapter. Some USB-C cables only carry power, not data, and they look identical to ones that do. Adapters and cables fail more often than drives.
Look in the right place. The drive appears under Browse → Locations in Files, not under Recents.
Check the format. A drive formatted for Linux or with an unusual format may not be recognized, and NTFS drives are typically read only.
Large files fail? The drive is almost certainly FAT32, which can't store a single file larger than 4 GB. Reformat it as exFAT after copying your data off.
The most common reason to connect a drive: backing up photos
For a handful of photos, the Files app is all you need: select them in Photos, tap Share, choose Save to Files, and pick the drive.
For a whole library, doing it by hand gets difficult quickly — selecting thousands of photos, remembering what you already copied, dealing with originals that live in iCloud, and checking that the copy worked. VaultDrive is built to make that part simple:
- Pick the drive once. VaultDrive remembers the drive you chose, so later backups start from where you left off.
- It warns you about FAT32 when you choose a drive, before a large video fails.
- It backs up the whole library or chosen albums — no selecting photos by hand.
- It downloads originals from iCloud when Optimize iPhone Storage has left only previews on the phone, over Wi-Fi only by default.
- It keeps your albums as folders on the drive and copies every photo at full quality, with Live Photos kept paired and capture dates intact.
- It checks each copy — size-matched, with an optional SHA-256 hash check — and flags anything that fails.
- With Pro, later backups copy only what's new.
- Your photos are never uploaded, and there's no account to create.
It's free for up to 200 files or 2 GB per backup, and Pro is a one-time purchase.
For the full walkthrough, see how to back up iPhone photos to a USB drive without a computer, and for the Files app compared with a dedicated app, Files app vs VaultDrive.
Frequently Asked Questions
Can you plug a USB drive directly into an iPhone?
Yes. Since iOS 13, iPhones can read and write external drives through the Files app. An iPhone 15 or later has a USB-C port, so a USB-C drive plugs straight in. An iPhone 14 or earlier has a Lightning port and needs a Lightning to USB adapter. Once connected, the drive appears under Browse in the Files app.
Which USB drive formats work with an iPhone?
exFAT, FAT32, APFS, and HFS+ can all be read and written. exFAT is the best choice because it also works on Windows and Android and has no practical file size limit. FAT32 cannot hold any single file over 4 GB. NTFS, common on drives used with Windows, can typically be read but not written.
Why is my USB drive not showing up on my iPhone?
The most common causes are power, the cable or adapter, and the drive's format. A drive that needs more power than the iPhone supplies may not appear or may disconnect, which a powered hub or the Lightning to USB 3 adapter with a charger attached can fix. Some cables only carry charge, not data. Also check the Browse tab in Files rather than Recents.
Can I back up my whole iPhone to a USB drive?
Not the whole device. iOS does not offer a full device backup to an external drive; a complete local backup of apps, settings, and messages still requires a Mac or PC. You can back up your photos, videos, and files to a USB drive directly from the iPhone, and use iCloud Backup for apps and settings.
How fast is transferring to a USB drive from an iPhone?
It depends on the model, the cable, and the drive. Pro models starting with the iPhone 15 Pro support USB 3 speeds with a USB 3 cable, while other models transfer at USB 2 speeds, and the cable in the box has typically been USB 2. A portable SSD is generally much faster than a basic flash drive.
Can I copy photos from my iPhone to a USB drive?
Yes. For a few photos, select them in the Photos app, tap Share, choose Save to Files, and pick the drive. For a whole library, a backup app like VaultDrive copies everything at original quality, keeps albums as folders, checks each file, and only copies new photos on later runs.
The short version
Yes — you can connect a USB drive directly to any iPhone running iOS 13 or later. Use a USB-C drive on an iPhone 15 or later, or a Lightning to USB adapter on older models. Format the drive exFAT, give power-hungry drives extra power, and find the drive under Browse in the Files app.
From there you can copy, open, and play files, and save photos in both directions. For backing up an entire photo library, VaultDrive turns the connection into a complete, checked backup that only copies what's new each time.