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Silver 2.5-inch bare SAS hard drive with exposed circuit board

Seagate

Seagate ST1200MM0158 1.2TB 10000 RPM 128MB SAS 12Gb/s 2.5" internal hard drive

SKU CH-1AA2-SGVH3 MPN ST1200MM0158

1.2 TB enterprise hard drive spins at 10,000 RPM with 128 MB cache and SAS 12 Gb/s interface in a 2.5 inch form factor

  • Total capacity1.2 TB
  • Interface typeSAS 12Gb/s
  • Form factor2.5 in (6.35 cm)
  • Packaging typeBare Drive
  • Rotational speed10,000 RPM
  • Cache memory128 MB
  • 2TB capacity fits more data in a 2.5-inch bay
  • 10000 RPM spindle speed reduces average latency for transactional workloads
  • 128MB cache absorbs write bursts to sustain throughput
  • SAS 12Gb/s interface delivers 1200MB/s external transfer rate
  • 5-inch form factor packs 1.8TB enterprise performance into half the space of 3.5-inch drives

1.2TB 10K SAS drive for servers

The Seagate ST1200MM0158 is a 1.2TB 2.5-inch enterprise hard drive spinning at 10000 RPM with a 128MB cache. It connects through a SAS 12Gb/s interface for high-throughput server and storage-array workloads.

Bare drive 15mm height fits dense bays

Supplied as a bare drive without carrier or cables, the unit measures 15.00mm high, 70.10mm wide and 100.46mm long. The 2.5-inch form factor allows more spindles per rack unit than 3.5-inch alternatives, while the 12Gb/s SAS connector supports dual-port redundancy in compatible backplanes.

TurboBoost and PowerChoice firmware features

Seagate TurboBoost accelerates I/O operations to maintain response times during peak demand. PowerChoice provides T10-compliant power management so administrators can tune consumption. The drive also presents 512e and 4Kn advanced format options for modern operating systems.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $382.99
Pricier than about 89% of the 4,938 comparable items (median $107.99).
Total capacity 1.2 TB
Lower than about 58% of the 2,372 comparable items (median 2 TB).
Price per TB $319.16 per TB
Pricier than about 85% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Model nameST1200MM0158
Total capacity1.2 TB
Recommended useIdeal for Servers
Performance
Rotational speed10,000 RPM
Mean latency12Gb/s
Storage
Cache memory128 MB
Ports & slots
Interface typeSAS 12Gb/s
Size & build
Form factor2.5 in (6.35 cm)
Max height15 mm
Maximum width70.1 mm
Maximum length100.46 mm
Shipping weight0.68 kg
Package size102 × 71 × 15 mm

Questions about this item

What does the SAS 12Gb/s interface cap the external transfer rate at?

The SAS 12Gb/s interface caps the external transfer rate at 1200MB/s, which is the maximum sustained throughput the drive can deliver to the host controller.

Will the 15.00mm height fit a standard 2.5-inch server bay?

The drive measures 15.00mm tall, 70.10mm wide and 100.46mm long, so it fits a 2.5-inch bay that accepts 15mm drives; verify the bay height before installing.

How is the bare drive installed and what step is often missed?

Mount the bare drive in a 2.5-inch tray or caddy, connect the SAS data and power cables, then configure the RAID controller or HBA to recognise the new LUN; the step often missed is completing the controller-level initialisation before the OS sees the volume.

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