30TB and 32TB Hard Drives: Seagate Exos M, IronWolf Pro and SkyHawk AI

Seagate 24TB to 32TB hard drives at a glance

ARC IP Networks lists ten Seagate drives from 24TB to 32TB. Every one is a 3.5-inch SATA 6Gb/s drive with CMR recording, 7,200 RPM and a 512MB cache, so the differences are about where the drive is built to work.

Families and best-fit uses from Seagate's datasheets for each model.

Seagate 30TB and 32TB hard drive specs compared

Every figure is from Seagate's datasheet or product manual for that model number. Workload is the maximum data read and written per year. MTBF is a population statistic, not a promise for any single drive.

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All ten: CMR, 7,200 RPM, 512MB cache, SATA 6Gb/s, 512e sectors. HAMR = listed as a key feature in the Seagate product manual for that model. Sources: Seagate IronWolf Pro datasheets DS2129.7-2510US and DS2129.4-2311US; Exos datasheet DS2046.1-2512; SkyHawk AI datasheet DS1960.16C-2509US; BarraCuda 3.5 datasheet DS17.2-2603US; Seagate product manuals 207967700B, 210048100E, 206815300B and 210547400.

What is a HAMR hard drive? Seagate Mozaic explained

HAMR stands for Heat Assisted Magnetic Recording. Seagate lists it as the first key feature in the product manuals for the IronWolf Pro 28TB, 30TB and 32TB and the Exos 28TB, 30TB and 32TB drives. On the Exos side, Seagate calls the platform Mozaic. Its Exos datasheet says:

• the latest Exos drives reach 3TB per platter, which is how a standard 3.5-inch drive gets to 32TB;
• they keep 90% of the proven components of earlier Exos generations alongside the new Mozaic technology;
• the form factor, interface and cooling are the same as earlier generations, so they slot into existing systems;
• they are sealed helium drives.

HAMR does not mean shingled recording. Seagate's tables mark every one of these drives as CMR (conventional magnetic recording), and its IronWolf Pro datasheet says the whole IronWolf Pro range is CMR.

One detail to watch: our 24TB drives (IronWolf Pro ST24000NT002 and Exos X24 ST24000NM002H) come from Seagate's earlier product lines. Their manuals do not list HAMR. Seagate also makes 24TB HAMR versions under different model numbers, so always go by the exact model number, not the capacity.

Who needs a 30TB or 32TB hard drive?

More terabytes per drive means fewer drives, fewer bays and fewer watts for the same capacity. That matters most in four places.

Large NAS for offices and studios

Seagate built IronWolf Pro for commercial and enterprise NAS in multi-bay, multi-user setups. Its best-fit list includes video production RAID, shared network storage, workstations and servers, and on-premises AI model training. An architecture practice in Brisbane, an editing suite in Sydney or a Melbourne agency with years of RAW photos can hold far more in a 4-bay or 6-bay NAS than it could a few years ago.

Servers, dense RAID and archives

Exos M is aimed at cloud providers and enterprise data centres. Seagate's best-fit list includes dense RAID or erasure-coded storage, virtualised environments, big-data analytics, backup and restore, distributed file systems such as Hadoop and Ceph, external storage arrays, NAS systems with more than 16 drive bays and data archiving.

Surveillance archives

SkyHawk AI 32TB is designed for NVRs, including AI-enabled NVRs. Seagate rates it for up to 64 HD video streams and 32 AI streams, with ImagePerfect AI firmware for zero dropped frames. That suits councils, shopping centres, schools, warehouses and mine sites that must keep long retention across many cameras. Our security camera storage sizing guide shows how to work out how many terabytes your cameras need.

Media libraries and home labs

A 4K Plex library, a drone footage archive or a home lab NAS fills drives quickly. The how much NAS storage do you need guide helps you size it before you buy.

How much usable space do 28TB to 32TB drives give?

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Raw usable capacity before formatting, using the standard RAID formulas: RAID 1 = one drive; RAID 5 = drives minus one; RAID 6 = drives minus two; RAID 10 = half the drives. The operating system shows a little less, because Seagate counts 1TB as one trillion bytes.

Exos M vs IronWolf Pro vs SkyHawk AI: what is different?

On paper the three 32TB drives look almost the same: 7,200 RPM, 512MB cache, 550TB/year, 2.5 million hours MTBF and a 5-year limited warranty. The differences are in firmware, features and support.

IronWolf Pro: the NAS drive

• Unlimited drive bays supported, with rotational vibration (RV) sensors for multi-bay systems.
• AgileArray firmware adds dual-plane balancing and time-limited error recovery for RAID.
• IronWolf Health Management on supported NAS systems, with prevention, intervention and recovery recommendations.
• 3 years of Rescue Data Recovery Services included. Seagate quotes a 95% recovery rate from its in-house facilities (not available in every country).

Exos M: the enterprise drive

• Built for cloud and enterprise data centres, with a published 0.35% annualised failure rate.
• Our Exos M models are the Instant Secure Erase (ISE) versions. They also list Super Parity, PowerChoice idle power modes, PowerBalance and RSA 3072 firmware verification.
• Hot-plug support under the SATA specification.
• No Rescue Data Recovery Services in the datasheet, so keep your backups current.

SkyHawk AI: the surveillance drive

• ImagePerfect AI firmware for zero dropped frames under heavier workloads.
• Up to 64 HD cameras (1080p, H.265, 25 fps in Seagate's test) and 32 AI channels.
• SkyHawk Health Management with RAID RapidRebuild, which Seagate says gives up to 3x faster volume rebuilds than conventional RAID.
• 3 years of Rescue Data Recovery Services (selected regions).

For a deeper look at the two NAS-friendly families at smaller sizes, read best hard drives for a NAS: Seagate IronWolf vs Exos.

Seagate 24TB: three very different drives

At 24TB, ARC IP Networks lists three Seagate drives, and they are not interchangeable.

• IronWolf Pro 24TB: the NAS drive, at 285 MB/s, with 3 years of Rescue Data Recovery. Seagate's datasheet quotes 20 dBA idle and 26 dBA seek, and 7.8W average operating power.
• Exos X24 24TB: the enterprise drive from the Exos X24 line (ISE model), at 285 MB/s, with a 0.35% annualised failure rate.
• BarraCuda 24TB: Seagate's desktop drive. Its best-fit list is desktop and all-in-one PCs, home servers and entry-level direct-attached storage. It is rated for 2,400 power-on hours a year and 120TB/year, with a 2-year warranty. For an always-on, multi-bay NAS, choose IronWolf Pro or Exos, which are rated for 8,760 hours (24x7).

RAID rebuild time with 30TB and 32TB drives

When a drive in a RAID array fails, the NAS rebuilds the missing data onto the replacement, reading every other drive in the set. With very large drives, that takes a long time, and the array has less protection until it finishes.

A simple way to see the scale: even writing at the drive's maximum sustained rate from Seagate's datasheets, filling the whole drive takes about:

Our arithmetic: capacity divided by the outer-diameter (OD) sustained rate in Seagate's datasheets. This is a best case; real rebuilds take longer.

That is the floor, not the estimate. The OD figure is the fastest part of the disk. The NAS is also serving users and running the rebuild at the same time, and parity calculations add work. Plan for rebuilds measured in days on a busy array. In practice:

• Use RAID 6 (or RAID 10) for big drives. RAID 6 survives a second drive failure during a long rebuild; RAID 5 does not. Our RAID explained guide walks through RAID 1, 5, 6 and 10, and RAID 5 vs RAID 6 and the 3-2-1 rule covers the trade-off.
• Keep a cold spare of the same model on the shelf, so the rebuild starts the day a drive fails, not after a delivery.
• Rebuild during quiet hours if your NAS lets you set rebuild priority.
• RAID is not a backup. A second copy on another NAS, external drive or cloud protects you from deletion, ransomware and fire.

IronWolf Pro (AgileArray, IronWolf Health Management) and SkyHawk AI (SkyHawk Health Management with RAID RapidRebuild) have firmware features aimed at RAID health and rebuilds when the NAS or NVR supports them.

Compatibility checks before you buy

• Form factor and interface: all ten are standard 3.5-inch SATA 6Gb/s drives, 26.1 mm high, 101.85 mm wide and 147 mm deep, so they fit normal 3.5-inch bays and trays. Seagate says the latest Exos keeps the same form factor, interface and cooling as earlier generations.
• Check the NAS or NVR compatibility list and the maximum capacity per drive your unit supports. ASUSTOR's compatibility lists, for example, include the IronWolf Pro and Exos 28TB to 32TB drives for its AS54 (Nimbustor), AS67 (Lockerstor Gen2 and Gen2+) and AS68 (Lockerstor Gen3) series. For a Hikvision NVR, see how to install or format a hard drive in a Hikvision NVR and our best Hikvision NVR guide.
• Update firmware first. Install the latest NAS or NVR firmware before adding a drive this large.
• Sector format: these drives ship as 512e (512-byte emulation on 4,096-byte physical sectors).
• Do not mix drive types in one array. Use matching models of the same capacity. RAID sizes every member to the smallest drive, and the BarraCuda's 2,400 hour rating makes it a poor partner for 24x7 drives.
• Power supply: each drive needs +12V and +5V. Seagate lists a typical spin-up current of 2.0A at 12V for IronWolf Pro and SkyHawk AI, and 2.6A peak for Exos (2.0A optional). Multiply by the number of bays when you size the power supply for a large server or DAS.
• Temperature: Seagate rates the 28TB to 32TB drives for 10°C to 60°C drive-reported temperature. Keep the NAS out of hot garages and unventilated comms cupboards in an Australian summer.

Power and noise: the datasheet figures

A 32TB drive draws about the same power as a 24TB drive, so watts per terabyte fall as capacity rises. Noise figures are typical sound power from Seagate's product manuals.

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Seagate measures operating power differently by family (average, typical or maximum), so compare like with like. Standby/sleep is 1.2W for IronWolf Pro 28TB to 32TB, SkyHawk AI 32TB and BarraCuda 24TB.

Any 7,200 RPM helium drive makes some seek noise. If a NAS sits in a home office, lounge or small reception area, choose a model with quiet fans, mount it on a solid surface away from desks, and schedule heavy jobs such as scrubs and backups overnight.

Seagate Exos 28TB and 30TB + ASUSTOR NAS bundles

Want the capacity and the NAS in one order? Our Seagate + ASUSTOR NAS bundles pair Seagate Exos 28TB or 30TB drives with a genuine ASUSTOR Nimbustor or Lockerstor NAS. ASUSTOR's compatibility lists include Seagate's Exos 28TB and 30TB models for the AS54 and AS67 series used in these bundles.

The bundle code shows the number of drives and the ASUSTOR model, for example 2X30TB-AS6702T-V2 is two Exos 30TB drives with a Lockerstor 2 Gen2+. The drives carry Seagate's 5-year limited warranty and the NAS carries ASUSTOR's 3-year warranty.

Not sure whether a bundle suits you? Read NAS with drives included: are NAS bundles worth it?

Which big Seagate drive for which Australian job?

ARC IP Networks suggestions, based on Seagate's published specifications.

Related guides

• NAS RAID explained: RAID 1, 5, 6 and 10
• NAS backup done right: the 3-2-1 rule and RAID 5 vs RAID 6
• Best hard drives for a NAS: Seagate IronWolf vs Exos
• How much NAS storage do you need? TB explained
• How much storage do you need for security cameras?
• Seagate + ASUSTOR NAS bundles
• Shop all Seagate drives