Which is better for a NAS?

The Exos M is the better fit. It is a named enterprise drive built for always-on workloads, while the other listing gives no model number or firmware details. Check the recertified status and warranty before you fill a NAS with them.

On paper the plain 28TB drive claims up to 270 MB/s and the Exos M claims 190 MB/s. Both are 7200 RPM helium CMR drives, so real sequential speeds should land in a similar range. Treat the numbers as vendor claims until you see benchmarks.

Is the Exos M worth the extra money?

Only if the price gap is small. You get a known model and enterprise firmware, but it is recertified. If the plain drive is much cheaper and you only need archive storage, the savings may matter more.

How long will these drives last?

The plain drive is rated at 2.5 million hours MTBF and 550 TB per year, which is a solid workload rating. The Exos M has no published figures here, and reviewers flag its recertified status. Back up either one regardless.

Can I use either in a desktop PC?

Yes. Both are 3.5-inch SATA 6Gb/s drives at 7200 RPM. The plain drive draws 8.3 W active, so give it airflow. The Exos M is designed for enterprise chassis but works in a desktop with a standard SATA connection.

Do either have hardware encryption?

The plain 28TB listing says no encryption support. The Exos M listing does not mention encryption. If you need SED, look for a model with that suffix.

Seagate Internal Hard Drive 28TB 7200 RPM 512MB Cache vs Seagate Exos M ST28000NM003K 28TB SATA 6Gb/s 7200RPM Internal Hard Drive

Both are 28TB Seagate 7200 RPM helium CMR drives, so capacity and speed class are the same. The Exos M ST28000NM003K is the enterprise line with a known model number and 3TB-per-platter design; the plain "Internal Hard Drive 28TB" listing gives no model number and only one rating. For most buyers the Exos M is the safer pick unless the other one is meaningfully cheaper. Compare current prices at each store before deciding.

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