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Small silver 2.5 inch enterprise SAS hard drive with SC tray

HP

HP 781518-B21 1.2TB 10000 RPM SAS 12Gb/s 2.5" internal hard drive

SKU CH-9590-9GV7T MPN 781518-B21

A 1.2 TB enterprise hard drive with 10000 RPM and SAS 12Gb/s interface in a 2.5 inch form factor

  • Total capacity1.2 TB
  • Interface typeSAS 12Gb/s
  • Form factor2.5 in (6.35 cm)
  • Rotational speed10,000 RPM
  • Key featuresThis HP 1.2 TB SAS 12Gb/s 10K RPM SFF 2.5 in SC Enterprise H
  • Recommended useFor Enterprise Storage
  • 2 TB capacity stores large enterprise datasets
  • 10 000 RPM spindle delivers fast data access
  • SAS 12 Gb/s interface provides high-throughput connectivity
  • 5 inch small form factor fits dense server bays
  • New condition ensures full manufacturer reliability

Enterprise SAS storage

The HP 781518-B21 is a 1.2TB 2.5 inch enterprise hard drive built for servers and storage arrays that require consistent throughput. Its 10000 RPM spindle speed and SAS interface target workloads such as databases, virtualisation and transactional applications where low latency matters.

SAS 12Gb/s interface limits

The drive connects through a 12Gb/s SAS link, so the host controller or backplane must support that signalling rate to realise full bandwidth. Performance will fall back to the highest speed both ends share, and cable length or expander topology can further constrain sustained throughput.

1.2TB capacity and 10K headroom

At 1.2TB the drive holds operating systems, application binaries and active data sets that benefit from 10000 RPM access times. It is not suited for cold archives or workloads needing multi-terabyte sequential capacity, where larger nearline drives or flash tiers are more appropriate.

How it compares

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

Price $655.99
Pricier than about 90% 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 $546.66 per TB
Pricier than about 90% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameHP
Model name781518-B21
Total capacity1.2 TB
Recommended useFor Enterprise Storage
Performance
Rotational speed10,000 RPM
Ports & slots
Interface typeSAS 12Gb/s
Size & build
Form factor2.5 in (6.35 cm)
Shipping weight4.08 kg
Package size222 × 184 × 133 mm

Questions about this item

Should I choose the 1.2TB version or a different capacity for this 781518-B21 drive?

The 781518-B21 is supplied only as a 1.2TB model. If your workload needs more space, you would add multiple drives rather than selecting a larger single unit.

What does the 10000 RPM rating mean for actual performance in a server?

The 10000 RPM spindle delivers lower latency and higher sustained throughput than slower drives, which helps with random I/O workloads such as databases or virtualisation.

How does the SAS 12Gb/s interface limit real-world transfer speed?

The SAS 12Gb/s link caps the maximum burst rate at 12Gb/s, while sustained throughput will be lower and depends on the drive's internal media speed.

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