Best Practices for Fast External Storage on Your MacBook Pro

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If your MacBook Pro is running out of storage and your external SSD feels sluggish, you may be missing critical steps in setup and hardware choice. On Hands-On Tech, Mikah Sargent shared proven advice for selecting the right external drive, cable, and format to achieve near-internal SSD speeds.

Quick Summary

The most common causes of slow external SSD speeds on Macs are using the wrong cable, picking a USB (not Thunderbolt) drive, or formatting drives in a way that limits macOS performance. Solving these issues can dramatically boost your data transfer rates and improve productivity, especially for photo, video, and large file work.

Why External SSD Performance Matters

Modern MacBook Pros, especially those with the latest Apple silicon chips, offer extremely fast built-in SSDs. However, storage upgrades are expensive at purchase, pushing many to rely on external drives. For tasks like video editing or managing large photo libraries, sluggish external drives can hinder workflow.

Drive shortages and higher prices make getting value from external SSDs more important than ever. Knowing how to set them up for max speed saves both time and money.

Troubleshooting Slow External Storage

On Hands-On Tech, Mikah Sargent outlined three main bottlenecks:

• Drive Type: Many external SSDs use USB 3.2 Gen 2, which maxes out around 1,000 MB/s—far below Thunderbolt’s capabilities.
• Cables: Not all USB-C cables are equal; some are “charge only” or top out at low USB 2 speeds (480 Mb/s). Using a certified Thunderbolt cable is essential.
• Formatting: Drives used mainly with Macs should be formatted APFS for best compatibility and reliability; using ExFAT is suitable for cross-platform use but can create stability risks.

How to Diagnose Drive Speed Issues

1. Check Drive Connection: Use your Mac’s system information (Option-click the Apple menu > System Information > Thunderbolt/USB4) to see if your SSD connects via Thunderbolt or USB.
2. Review Drive Speed: Drives showing as “USB” may be capped at 10Gbps or 1,000 MB/s; Thunderbolt drives should appear under Thunderbolt/USB4 and can hit 40Gbps+.
3. Test Cables: Swap in a certified Thunderbolt cable (from Apple, Belkin, or Caldigit) and see if speeds improve.
4. Formatting Matters: For exclusive Mac use, format the drive as APFS via Disk Utility for optimal performance.

Choosing the Right External SSD

Mikah Sargent recommends choosing based on your needs and budget:

• USB 3.2 Gen 2 SSDs (e.g., Samsung T7): Around 1,000 MB/s. Good for bulk storage or infrequent access, but they lag for active project work.
• Thunderbolt SSDs: Typically 2,800–3,000 MB/s, e.g., SanDisk, OWC Express One M2 (enclosure ~$120, NVMe blades sold separately), or Lacie Rugged SSD Pro. These “sweet spot” drives cost more (prices around $400–$500 for 1-2TB) but offer drastically better speeds and reliability.
• Thunderbolt 5 Drives: Up to 6,000 MB/s for demanding tasks like 4K/8K video editing. If you need maximum speed and have the budget, these are best but expensive.

Price Check: As of June 7th, a 2TB SanDisk Thunderbolt SSD was $530+, and OWC/LaCie Thunderbolt enclosures ranged from $120 (bare) to nearly $500 (with 1TB NVMe SSD).

Best Practices for Setup

• Always use a cable rated for your drive’s speed/interface.
• Prefer the cable included with your SSD when possible; third-party is fine if certified.
• Avoid legacy formats like macOS Extended for new SSDs; avoid NTFS unless you install third-party Mac drivers.
• For stability, never unplug drives during transfers, especially with ExFAT.

Key Takeaways

• Internal Mac SSDs are always fastest, but a quality Thunderbolt external SSD can come close for most workflows.
• Most “slow external drive” complaints trace to an underperforming cable or drive, not the Mac itself.
• Certified Thunderbolt cables and properly formatted drives are must-haves for MacBook Pro users who demand performance.
• Investing in a solid Thunderbolt enclosure lets you upgrade storage affordably as prices change and needs grow.

The Bottom Line

For MacBook Pro users hitting storage limits, upgrading to a Thunderbolt external SSD (with a certified cable and APFS formatting) offers the next-best performance to internal storage—ideal for media production and heavy file work. If budget is tight, start by replacing your cable and checking current drive specs before shopping for a new drive.

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