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Seagate Constellation.2 and Constellation ES.2 Hard Drive Review

Seagate’s Constellation enterprise hard drives come in 6Gbps SAS and SATA interfaces; we pit them against one another using the second-gen Constellation.2 2.5″ drive and fifth-gen Constellation ES.2 3.5″ drive. The following models are participating in this review:

  • Seagate Constellation ES.2 3TB – SAS interface (ST33000650SS)
  • Seagate Constellation ES.2 3TB – SATA interface (ST33000651SS)
  • Seagate Constellation.2 1TB – SAS interface (ST91000640SS)
  • Seagate Constellation.2 1TB – SATA interface (ST91000641SS)

First let’s consider the 2.5-inch Constellation.2. Seagate says this second-generation drive is the first 2.5-inch enterprise drive with a 1TB capacity in a 15mm z-height drive. Designed for 24/7 operation, it features a 7200RPM spindle speed and 64MB cache. The company claims the drive consumes 6.4 watts of power or less on average, or 41% less than typical 3.5-inch enterprise drives. The Constellation.2 is also available in 500GB and 250GB capacities (250GB in SATA 6Gbps only). The 1TB drive has four 250GB platters.

The fifth-generation Constellation ES.2 is a 3.5-inch drive with a 7200RPM spindle speed and 64MB cache. Seagate claims it is the lowest power to operate 3TB enterprise drive on the market at less than 12W on average. It has five platters with 600GB/platter density.

Both drives are backed by a five-year limited warranty.

Something to watch for in this review is differences between the SAS 6Gbps and SATA 6Gbps interfaces in overall performance. Seagate posts identical numbers for both drives, with the SATA drives consuming slightly more power. We expect there to be little overall difference but will wait for the synthetic and real-world benchmarks to tell the true story.

Keep in mind that enterprise drives are designed for server-style workloads, especially ones involving multiple requests at once. This will become apparent in the IOMeter server benchmarks.

Read the full review at


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