Which is better for a NAS?

The IronWolf Pro. It is rated for 550TB per year, has a 2.5 million hour MTBF, vibration tolerance for multi-bay use and NAS vendor compatibility testing. The Exos M is aimed at bulk cloud storage, not 24x7 RAID.

Is the Exos M new or recertified?

Reviewers describe it as a recertified unit. Check the condition stated on the listing before you buy, since recertified drives usually carry a shorter warranty.

The IronWolf Pro, at up to 270 MB/s sustained versus 190 MB/s read for the Exos M. The gap matters most when rebuilding a RAID array or copying large files.

Is the IronWolf Pro worth the extra cost?

Yes for a NAS or any always-on array. The workload rating, MTBF, health monitoring and three years of data recovery are what you pay for. For offline backup of media, the Exos M is the cheaper way to get 28TB.

Do both drives work in a desktop PC?

Yes. Both are 3.5-inch SATA 6Gb/s drives at 7200rpm, so either fits a standard desktop bay and SATA port. The IronWolf Pro's 8.3W active draw needs decent case airflow.

The IronWolf Pro has the published endurance figures: 550TB per year and 2.5 million hours MTBF. The Exos M has no published rating in the listing, and recertified drives have already seen use.

Seagate Exos M ST28000NM003K 28TB SATA 6Gb/s 7200RPM Internal Hard Drive vs Seagate IronWolf Pro 28TB NAS Internal HDD Hard Drive

Both are 28TB Seagate 7200rpm helium CMR drives, but they are built for different jobs. The Exos M is a bulk-storage drive often sold recertified at a lower price, while the IronWolf Pro is a new NAS drive with a 550TB/year workload rating, 2.5 million hour MTBF and three years of Rescue Data Recovery. Buy the IronWolf Pro for a NAS or RAID array; buy the Exos M only if the price gap is large and you accept recertified stock.

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