Most external drives you’ll find at any retailer ship formatted for Windows — they use a file system called NTFS (short for NT File System, the default Windows storage format). Plug one into a Mac and macOS can read files off it just fine, but it won’t let you write anything new without extra software or a reformat. That single friction point accounts for an enormous percentage of confused one-star reviews, and it’s almost entirely avoidable. This guide exists to get you past that moment in about 60 seconds, explain the tradeoffs between the main Mac-compatible formats, and help you pick a drive and workflow you won’t have to revisit for years. Whether you’re setting up Time Machine for automatic backups, building a portable archive for client deliverables, or just moving large files between machines, the decisions you make in the first five minutes after unboxing matter a lot.
| EDITOR'S PICKWD 4TB My Passport Ultra | Mid-tier[Seagate Portable 4TB External H](https://www.amazon.com/dp/B07CRGSR16?tag=greenflower20-20)… | Budget pick[Seagate Portable 1TB External H](https://www.amazon.com/dp/B07CRG7BBH?tag=greenflower20-20)… | |
|---|---|---|---|
| Capacity | 4TB | 4TB | 1TB |
| Interface | USB-C / USB 3.1 | USB 3.0 | USB 3.0 |
| Backup software | ✓ | — | — |
| Password protection | ✓ | — | — |
| Rescue service | — | ✓ | ✓ |
| Color | Silver | — | Black |
| Price | $259.99 | $189.99 | $109.99 |
| See on Amazon → | See on Amazon → | See on Amazon → |
Why Every Drive Arrives “Wrong” for Mac — and How to Fix It in Disk Utility
Drive manufacturers default to NTFS because it works on the largest installed base: Windows. When you plug a new WD Elements, Seagate Portable, or WD My Passport into a Mac running Sonoma or Sequoia, macOS will mount it in read-only mode. You’ll see the drive on your desktop, you can open files, but you can’t save to it. This surprises a lot of buyers.
The fix is genuinely as fast as reviewers describe. Open Disk Utility (press ⌘ + Space, type “Disk Utility,” hit return), select your external drive in the left sidebar, click Erase, choose your format, name the drive, and click Erase again. Done. PCMag’s guide to formatting external drives for Mac confirms this is a single-session operation that takes under two minutes on most drives, including time for the format to complete on a brand-new, empty drive.
Which format should you choose?
| Format | Best for | Cross-platform? | Time Machine? |
|---|---|---|---|
| APFS (Apple File System) | SSDs, macOS-only workflows | Mac only | Yes (macOS 11+) |
| Mac OS Extended (HFS+) | HDDs, Time Machine, older Macs | Mac only | Yes |
| ExFAT | Shuttling files between Mac and Windows | Both | No |
The practical decision rule: if this drive will only ever live in a Mac ecosystem, format it Mac OS Extended (Journaled) for a spinning hard drive (HDD) or APFS for a solid-state drive (SSD). If you need to move files to Windows machines regularly — say, handing off video deliverables to a client — ExFAT is the compromise. It’s readable and writable on both platforms but lacks journaling, which means you have a slightly higher risk of data corruption if a drive is ejected improperly.
One thing worth naming explicitly: formatting erases everything on the drive. On a brand-new drive that has nothing on it yet, there’s no risk. On a drive with existing data you care about, copy those files somewhere safe before you reformat.
M1, M2, and M3 Mac Compatibility: What’s Actually Changed
Owners of M1 and M2 MacBook Pro systems consistently report that drives like the WD Elements and WD My Passport connect and work without any additional drivers or configuration — the drives just appear on the desktop, ready to use after reformatting. Apple Silicon Macs (the M-series chips that replaced Intel in 2020) use the same USB and Thunderbolt standards as their predecessors, so compatibility is a non-issue for the drives themselves.
What has changed is the port situation. Newer MacBook Pro and MacBook Air models have USB-C / Thunderbolt ports, not the older USB-A ports that older portable drives assumed. Most entry-level portable drives in the WD Elements and Seagate Portable lines still ship with USB-A cables. You’ll need either a USB-A to USB-C adapter or a drive that comes with a USB-C cable (or both cables in the box). WD My Passport’s newer SKUs include both cable types — worth confirming before you buy if your Mac has only USB-C ports.
According to Ars Technica’s coverage of macOS storage driver changes, Apple Silicon Macs have had full APFS, HFS+, and ExFAT support since macOS Big Sur, and there have been no meaningful external drive compatibility regressions through Sonoma. You don’t need Paragon NTFS, Tuxera, or any third-party driver for a properly formatted drive.
Time Machine, Backup Software, and the “I Don’t Need the Bundle” Reality
Time Machine is Apple’s built-in, automatic backup system. It takes hourly snapshots of your Mac, keeps daily backups for the past month, and weekly backups as space allows. It works with any properly formatted HFS+ or APFS drive. You don’t need WD Discovery, Seagate’s included backup software, or any other bundled application.
WD My Passport buyers repeatedly note that while the bundled WD Discovery software works on macOS, many find it unnecessary once they realize Time Machine does exactly what they need. If your use case is straightforward — “back up my Mac automatically” — Time Machine is the right tool, and the bundled software is optional clutter.
That said, there’s one meaningful gap in Time Machine: it doesn’t run when the drive isn’t connected. For a portable drive that sits in a bag most of the time, backups only happen when you plug in. That’s an argument either for leaving a dedicated drive plugged in at your desk or layering in a cloud backup (Backblaze Personal Backup at roughly $9/month as of May 2026 runs continuously in the background) to cover the gaps.
A note on restore testing — and this matters more than the backup setup itself. An untested backup is essentially a promise with no verification. Once you’ve set up Time Machine, do a trial restore. In macOS, you can enter Time Machine from System Settings → General → Time Machine, browse to a past snapshot, and restore a single file to confirm the backup is actually readable. Wirecutter’s external drive coverage consistently flags this step as the most skipped and most important part of any backup setup.
The Cable Problem Nobody Talks About Loudly Enough
Across reviews of the WD Elements, Seagate Portable, and similar budget-to-mid-range drives, one recurring complaint stands out: the included USB cable fails. Not immediately — usually after six to eighteen months of regular use. The connector near the drive end in particular sees repeated stress from plug/unplug cycles.
When a cable degrades, the symptom is exactly what the FAQ below addresses: the drive randomly disconnects from the Mac, or shows up intermittently, or prompts the “disk not ejected properly” error message. Many buyers spend time troubleshooting the drive when the fix is simply replacing a $6–$10 USB cable.
The proactive move: replace the included cable with a quality braided USB-C or USB-A cable (depending on your Mac’s ports) soon after purchase. Don’t wait for the problem to appear when you’re mid-transfer on a deadline.
HDD vs. SSD: The Price Gap Is Still Real, and the Math Still Favors Waiting
By the numbers (May 2026):
- 4TB portable HDD (e.g., WD Elements Portable): ~$0.025–$0.030/GB
- 2TB portable SSD (e.g., Samsung T9): ~$0.07–$0.09/GB
- Speed delta: SSD ~1,000–2,000 MB/s vs. HDD ~100–130 MB/s (USB 3.2)
One framing that keeps appearing in buyer reviews, and that Backblaze’s annual hard drive reliability data supports as a reasonable heuristic: for backup and archive duties where you’re not frequently reading files, the HDD price advantage is hard to argue against. You get roughly 2–3× the capacity per dollar compared to portable SSDs. For a Time Machine volume or a cold archive of RAW files you access twice a year, transfer speed is mostly irrelevant — the backup runs overnight.
If you’re moving large video files between your drive and your edit timeline regularly, or if portability and drop resistance matter (a drive that lives in a bag), the SSD premium is justified. Tom’s Guide’s best external hard drives roundup frames this as a genuine use-case split, not a simple “buy the better one” recommendation.
The decision rule: archive and backup → HDD. Active project storage or travel → SSD.
Frequently Asked Questions
Do I need to reformat a WD or Seagate drive to use it with a Mac? Yes, if you want to write files to it. Both brands ship drives in NTFS format, which Macs can read but not write to without third-party software. A quick reformat in Disk Utility (Erase → Mac OS Extended or APFS) takes under two minutes and gives you full read/write access.
Will these drives work with an M1 or M2 MacBook Pro without extra software? Yes. Owners of M1 and M2 MacBook Pros consistently report plug-and-play compatibility with WD and Seagate portable drives after reformatting. No drivers required. You may need a USB-A to USB-C adapter or a drive that includes a USB-C cable if your MacBook only has USB-C ports.
Can I use these drives with Time Machine? Yes. Format the drive as Mac OS Extended (Journaled) or APFS, then go to System Settings → General → Time Machine → Add Backup Disk. Time Machine will take it from there. You do not need the bundled WD or Seagate backup software.
Why does my external drive keep disconnecting from my Mac? The most common cause — by a significant margin, based on aggregated review patterns — is a failing or low-quality USB cable, specifically the one that came in the box. Try a different cable before assuming the drive has a fault. Other causes include a bus-powered drive not getting sufficient USB power (try a powered hub or a different port), and macOS’s energy-saving settings putting the drive to sleep (adjustable in System Settings → Battery → Options).
Is the included USB cable reliable long-term? Typically no. Multiple buyers across WD and Seagate lines report cable failure within six to eighteen months of regular use. The drive itself is usually fine. Replacing the cable proactively — especially with a braided, higher-quality cable — is a low-cost way to avoid a frustrating mid-use failure.
Do I need Paragon NTFS or is there a simpler fix? Paragon NTFS (and its competitor Tuxera) are third-party drivers that give macOS write access to NTFS-formatted drives without reformatting. They’re useful if the drive contains Windows data you can’t afford to erase. If you’re starting with a new or empty drive, just reformat it in Disk Utility — it’s faster, free, and eliminates the driver dependency entirely. Per PCMag’s how-to coverage on Mac drive formatting, the Disk Utility route is the recommended path for any drive that doesn’t need to stay Windows-compatible.
The if/then summary:
- If you’re setting up a dedicated Mac backup drive → format HFS+, use Time Machine, test a restore within the first week.
- If you need cross-platform compatibility → format ExFAT, skip Time Machine, manage backups manually or with a tool like Carbon Copy Cloner.
- If you’re prioritizing capacity on a budget → HDD at $0.025–$0.030/GB wins. Save the SSD premium for active project drives.
- If your drive keeps disconnecting → replace the cable before anything else.
- If you want the simplest possible setup → any mid-range WD or Seagate portable drive, reformatted in Disk Utility on first use, with Time Machine running and a calendar reminder to test restore every 90 days, is a genuinely solid foundation.