Exos 28TB exact-model authority
Seagate Exos 28TB: Exact Models, Prices and Deployment Guide
The Seagate Exos 28TB category contains exact models with generation, interface and service differences that should not be blended. This guide goes beyond a specification card to cover compatibility, array economics, power, noise, rebuild planning, validation and current exact-model offers.
Quick answer
For a standard SATA deployment, begin with ST28000NM003K when it matches the host and current inventory. Confirm the full model, interface, sector format, seller and serial-based warranty before buying. Calculate array-level usable capacity and keep independent backups; 28TB density does not remove rebuild or failure risk.
Exact model data
Tracked Seagate Exos 28TB exact models
| Capacity | Model | Generation | Interface | Sector format | Security | Recording | Cache | Max sustained | Status |
|---|---|---|---|---|---|---|---|---|---|
| 28TB | ST28000NM003K | Exos M | SATA | 512e/4Kn FastFormat | ISE | HAMR-CMR | 512MB | 270MB/s | Current Mozaic channel model |
Do not infer the interface or security class from “Exos 28TB.” Confirm the entire model number. Values marked Verify are intentionally not copied from another capacity or revision.
Live catalogue
Current exact-model Exos 28TB offers
Verified exact-model identity remains eligible for at least 336 hours after successful confirmation. Amazon prices and images refresh separately on 24-hour clocks. If Amazon exposes buying options without one featured numeric price, the card shows Price Options. Generation, interface, capacity, security class and exact model are enforced.
Interactive decision tool
Plan a high-capacity Exos deployment
Calculate redundancy-adjusted capacity, reserve and one-year growth headroom, then identify a tracked exact model for the selected interface.
What the Seagate Exos 28TB label does and does not tell you
A capacity label is only the first filter. At 28TB, the exact model number determines the Exos generation, controller interface, sector-format options and security class. Tracked options include ST28000NM003K. A retailer title can shorten those distinctions, so the model on the product page and delivered drive label must agree before installation.
This page treats 28TB as a deployment decision rather than a single blended specification. That prevents a SATA system from being matched to SAS, and prevents one revision from inheriting another revision’s cache, speed or support terms.
Where 28TB sits in the Exos capacity ladder
Twenty-eight terabytes is an early high-density Exos M step. It can be attractive when 24TB no longer meets growth targets but 30TB or 32TB carries a larger price premium. Its value depends heavily on live price per terabyte and the cost of consuming another bay. The practical question is whether 28TB reduces the number of bays, parity drives and future expansion steps enough to justify its current price. Price per terabyte is useful, but chassis scarcity, power connectors, spare strategy and rebuild exposure can be more important than a small purchase-price difference.
Use the planner above with a reserve rather than filling an array to its theoretical maximum. Cloudzat applies a 15% planning reserve in the tool so snapshots, metadata, filesystem behaviour and growth have room to operate.
SATA and SAS are different purchase paths
SATA is the usual choice for desktop systems, many NAS appliances and common server backplanes. SAS requires a compatible SAS HBA, RAID controller or SAS backplane. A passive connector cable cannot turn a SATA-only host into a SAS host.
Some Exos capacities are offered in both interfaces under similar titles. Confirm the entire model number and connector before buying. Also check whether the appliance vendor qualifies that exact capacity and sector format, especially when installing a drive larger than the systems available when the chassis was released.
Understand 512e, 4Kn and FastFormat before installation
Tracked enterprise Exos models commonly ship with a default logical sector format and may support FastFormat conversion between 512e and 4Kn. Host support is not universal. Older operating systems, USB bridges, RAID controllers and NAS firmware may reject or misreport a format they do not support.
FastFormat conversion is destructive. It should be treated like a secure reprovisioning event: back up all data, identify the exact device, confirm power stability and validate the result before adding the drive to an array. Never change format simply because one benchmark or forum post recommends it.
Performance expectations for Exos M
The tracked Exos M records on this page publish up to 270MB/s maximum sustained transfer and 512MB cache where those values are verified for the exact model. That is sequential media throughput, not a guarantee for every file transfer, RAID layout or workload.
Small random I/O, concurrent users, filesystem metadata, controller limits, network speed and array parity can dominate real performance. For bulk backup, media and sequential storage, the drive can move large streams efficiently. For latency-sensitive databases or virtual-machine working sets, an SSD tier or cache may still be necessary.
Noise, vibration and cooling in non-enterprise rooms
Exos drives are designed for enterprise chassis, not silence. Seek activity can be sharper than consumer or NAS-focused drives, and a group of synchronized 7,200 RPM drives can transmit vibration through a light desktop enclosure.
Use a rigid chassis, secure mounting, adequate airflow and a fan curve based on drive temperature rather than CPU temperature alone. Do not wrap drives in sound-deadening material that traps heat. Buyers placing an array near a desk, bedroom or studio should treat acoustics as a real compatibility requirement.
Power, spin-up and enclosure planning
Large arrays can draw their highest current during spin-up. The power supply, backplane and cabling must support the entire group, not merely one 28TB drive. Staggered spin-up can reduce the instantaneous load when the controller and drive configuration support it.
Check the number of native power connectors, avoid overloaded splitter chains and confirm cooling at the front and rear of the drive cage. A high-capacity build saves bays only when the remaining infrastructure can reliably power and cool those bays.
Rebuild exposure and spare strategy
A 28TB replacement can take a long time to rebuild because the system must read substantial data from every surviving member while ordinary workload continues. Rebuild duration depends on utilization, array layout, controller policy, errors, throttling and concurrent traffic, not simply the drive’s headline transfer rate.
For multi-drive arrays, keep tested backups and consider a cold spare or rapid procurement route. A hot spare shortens response time but remains powered and aging. A cold spare must be periodically checked and stored correctly. Neither parity nor a spare replaces an independent backup.
How to evaluate a current Amazon offer
The catalogue accepts only new, exact-model internal Exos listings. It rejects recertified, refurbished, multipack, external, SSD, MACH.2, Exos Xz and wrong-capacity substitutions. Listings without a featured Amazon price can still appear as buying-options records when the exact model is returned.
Before checkout, compare the title, model field, product image and seller notes. After delivery, compare the label with the ordered model before opening the antistatic bag or initializing the drive. Verify that warranty eligibility follows the serial number, seller and destination region.
New drive validation before production use
Record the serial number and photograph the label. Inspect the packaging and connectors, check warranty status, read SMART data and run an appropriate extended diagnostic before entrusting the drive with unique data. A long test on a new drive is easier to schedule before it joins a production array.
After testing, install with current firmware and monitor temperature, interface errors, reallocated sectors and pending sectors. A CRC error can indicate a cable or backplane problem rather than media damage. Establish a baseline so future changes are easier to interpret.
When 28TB is the wrong capacity
It may be the wrong choice when the 30TB model is only slightly more expensive, when the platform has not qualified the newer generation, or when established X24 spares and procedures are more valuable than density. A smaller capacity can be smarter when it has much better price per terabyte, matches existing spares or stays inside a validated appliance limit. A larger capacity can be smarter when bays are scarce, licensing is per drive or expansion disruption is expensive.
Calculate the complete array cost: drives, parity overhead, spare, power, controller, enclosure and backup. The cheapest single drive can produce the more expensive system if it consumes extra bays or forces an earlier chassis upgrade.
Bottom-line buying framework
Buy a tracked 28TB Exos model when the exact interface is supported, the enclosure accepts the capacity and sector format, the noise and cooling are acceptable, and the price works at array level. Prefer the newer model only when its qualification, availability or density provides a real operational benefit.
Do not buy from capacity alone. Exact model, interface, format, security variant, condition, seller and warranty source are the minimum checks. Use Cloudzat’s Exos price page for wider price-per-terabyte context, then return here for deployment-specific analysis.
How Cloudzat evaluates Exos drives
Cloudzat attaches generation, interface, sector format, security class, recording technology, cache, transfer rate and warranty only to an exact model. Exos X18, X20, X22, X24, Exos M and the verification-required Exos M 3+ records remain separate. This prevents a SATA listing from inheriting SAS specifications or an Exos M drive from inheriting X24 data.
Live offers are screened for new single internal 3.5-inch drives and matched to an exact model. SATA and SAS are kept separate. SSDs, external drives, accessories, enclosures, servers, multipacks, MACH.2, Exos Xz host-managed SMR, other drive families and non-new listings are rejected. Warranty source and delivered-label verification remain essential.
Frequently asked questions
Seagate Exos 28TB questions answered
Which exact Seagate Exos 28TB model should I buy?
Can I use an Exos 28TB drive in a NAS?
Is Exos 28TB CMR?
Should I choose SATA or SAS?
Does 512e versus 4Kn matter?
How long does an Exos 28TB RAID rebuild take?
Are Exos drives too loud for home use?
Does a new Exos drive always have a five-year Seagate warranty?
Why is an exact Amazon listing missing a price?
What should I test when the drive arrives?
Primary sources
- Seagate Exos M 24TB–32TB data sheet
- Seagate Exos M SATA product manual
- Seagate warranty and replacement support
Cloudzat may earn a commission from qualifying purchases. Product availability, pricing and specifications can change. Confirm the exact Exos model, generation, interface, sector format, security variant, seller, condition and regional warranty route before buying.