What’s the largest capacity HDD My Book Live can take?

What we know about My Book Live’s drive support The My Book Live is designed with a 3.5‑inch SATA hard drive inside.

WD’s official documentation for the Live shows it originally shipped with 1 TB, 2 TB, or 3 TB drives.

According to the “Hard Drive Compatibility Matrix” from WD support, for the related model WD My Book Live Duo (the two‑bay variant), WD says that the drives “must be the same model they came with.” Meaning WD does not officially support replacing the drives with larger/smaller/disparate models.

WD has formally ended official support for My Book Live (firmware updates, support service) as of 2019.

Conclusion from WD’s side: WD does not officially guarantee compatibility with larger or different-capacity drives beyond what shipped with the device. Swapping to a larger drive is thus an unofficial hack — unsupported by WD.

What the user community says (practical experiments)

Because WD doesn’t officially support drive-swapping, many users have experimented. From community discussions:

Some My Book Live users reported successfully installing 4 TB or 6 TB drives.

Others have attempted much larger drives (6 TB, 8 TB, 10 TB) — but with no universal guarantee. According to a 2015 thread on WD’s own community forum, one user said (about replacement drives in My Book Live): “It seems the largest capacity for this drive is 8 TB, in my opinion … but what you are trying to do might not work.”

In a more recent thread (2025), a user asked if 6 TB or 10 TB drives could be used; but WD’s support stance remains: the original drive model should be retained.

Conclusion from community experiments: 4 TB and 6 TB drives often work; some people claim success with 8 TB or larger — but results vary, and there’s no consistent success for 10 TB+ drives.

What’s the “largest practical capacity” (with caveats)

Given the mismatch between WD’s official support and community experiments, here’s a practical guideline:

Safe option (most likely to work): Replace with a 3 TB, 4 TB, or 6 TB 3.5" SATA HDD. These offer a good balance of capacity and reliability without pushing the enclosure beyond “typical” drive spec.

Possibly workable (but unofficial): You may be able to get 8 TB drives to work — some users report success, but it’s inconsistent.

Not recommended / high risk: Drives above 8 TB (like 10 TB, 12 TB, etc.) — extremely unlikely to work reliably due to enclosure firmware, drive compatibility, partitioning, and power/thermals.

If you try a larger drive, make sure to:

Use a conventional 3.5" SATA desktop HDD (not 2.5"-laptop drives).

Format and partition the drive properly (often ext3/ext4 or a Linux‑compatible filesystem, since My Book Live firmware is Linux-based)

Monitor for heat and power issues — older enclosures weren’t designed for high‑capacity/ high‑density drives running 24/7.

Why Larger Drives Are Uncertain

The firmware of My Book Live was built around earlier WD “Green” / “Caviar” drives (1–3 TB) and may impose internal limits (e.g. on partition size, sector addressing).

WD’s official policy discourages drive replacement — meaning future updates, firmware patches, or troubleshooting are not guaranteed to support custom drives.

As My Book Live is end-of-life (no ongoing support), users assume full responsibility for any modifications — including the possibility of data loss, warranty voiding, or instability.

My Recommendation (Based on Trade‑off Between Capacity & Stability)

If you want a stable, reliable NAS-like storage using a My Book Live enclosure:

Go for 4 TB or 6 TB — this is the “sweet spot”: high capacity, relatively safe, and widely reported working.

Treat anything above 6 TB (especially 8 TB+) as experimental — only attempt if you’re ready to accept risk, backup data, and potentially troubleshoot or reformat.

If you need very large storage (10 TB+), it may be more practical to upgrade to a modern multi-bay NAS enclosure that explicitly supports high-capacity drives.

Summary (in a Nutshell)

WD does not officially support replacing the HDD in My Book Live; drive-swapping is unofficial.

User community tests show 4 TB and 6 TB are reliably usable; 8 TB works occasionally; 10 TB+ is high-risk.

The “largest practically reliable capacity” is therefore 6 TB — possibly 8 TB if you’re willing to gamble.

If you like, I can check exact latest HDD models (as of 2025) that people have successfully used in My Book Live — that might help you pick a robust replacement drive. Do you want me to pull that list together for you now