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Rectangular 2.5 inch silver metal laptop hard drive with green circuit board visible underneath

Seagate Refurbished

Seagate ST91000640SS-RF 1TB 7200 RPM 64MB Cache SAS 6Gb/s 2.5" laptop hard drive

SKU CH-CSZA-5EVBS MPN ST91000640SS-RF

A 2.5 inch 1 TB SAS laptop drive with 7200 RPM and 64 MB cache for fast internal storage

  • Total capacity1 TB
  • Interface typeSAS 6Gb/s
  • Form factor2.5 in (6.35 cm)
  • Cache memory64 MB
  • Average seek time9.5 ms
  • Mean latency4.16 ms
  • 7200 RPM spindle speed enables faster data access
  • 64MB cache buffer improves burst transfer performance
  • SAS 6Gb/s interface provides reliable enterprise connectivity
  • 5 inch 15mm form factor fits compatible laptop bays
  • Refurbished condition offers cost-effective storage upgrade

Capacity and interface

This refurbished Seagate ST91000640SS-RF provides 1TB of storage in a 2.5-inch form factor. It connects via a SAS 6Gb/s interface and spins at 7200 RPM with a 64MB cache. The drive measures 15mm in height.

Suitable systems and limitations

The SAS interface suits servers or workstations that support this protocol. Laptops or enclosures that accept only other interfaces will not be compatible. Buyers needing a different physical height or a higher capacity should consider other models.

Deciding specification

The SAS 6Gb/s interface is the single specification that determines whether this drive fits the host system. Verify that the controller and backplane support SAS before purchase.

How it compares

Measured against everything we stock in 2.5-Inch Internal Laptop HDDs, at today’s prices. Recalculated every night.

Price $159.99
Pricier than about 80% of the 645 comparable items (median $66.99).
Total capacity 1 TB
Higher than about 90% of the 419 comparable items (median 320 GB).
Price per TB $159.99 per TB
Cheaper than about 65% of the 416 comparable items (median $233.48 per TB).

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Specifications

Product
Brand nameSeagate
Model nameST91000640SS-RF
Total capacity1 TB
Performance
Average seek time9.5 ms
Mean latency4.16 ms
Rotational speed7,200 RPM
Storage
Cache memory64 MB
Ports & slots
Interface typeSAS 6Gb/s
Size & build
Form factor2.5 in (6.35 cm)
Max height15 mm
Shipping weight0.45 kg
Package size127 × 76 × 51 mm

Questions about this item

Is the 1TB 7200 RPM 2.5" 15mm height the right capacity and form factor for my laptop?

This drive offers 1TB at 7200 RPM with a 15mm z-height; verify your laptop accepts 15mm 2.5" bays before purchasing.

What does the 9.5ms average seek time and 4.16ms latency mean for everyday use?

The 9.5ms seek and 4.16ms latency reflect mechanical 7200 RPM performance; expect typical HDD responsiveness for OS and data workloads.

My system has a SAS 6Gb/s backplane — will this drive saturate that link?

The SAS 6Gb/s interface caps the burst transfer at 6Gb/s; sustained throughput is limited by the 7200 RPM mechanics and 64MB cache.

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