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Report on New Energy Efficiency Standards for Magnetic Disk Units Compiled

August 20, 2020

A working group on energy efficiency standards (*1), a body established under the Agency for Natural Resources and Energy (ANRE), compiled a Report on New Energy Conservation Standards for Magnetic Disk Units (*2).

ANRE has been operating the standard energy consumption efficiency (energy efficiency standards) for magnetic disk units, setting FY2011 as its target fiscal year under the Act on the Rational Use of Energy (Act No. 49 of 1979). Since the fiscal year, digitalization and networking has advanced and demands of data centers and other facilities for large volume storage systems have been growing. Against this backdrop, ANRE considers it necessary to encourage manufacturers to further improve the performance of magnetic disk units in terms of energy consumption by stipulating new energy conservation standards for such units.

In light of this situation, a working group on energy efficiency standards, a body established under ANRE, held a meeting (on June 29, 2020) and then compiled the discussion results into a Report on New Energy Conservation Standards for Magnetic Disk Units, which describes new energy efficiency standards and other rules for magnetic disk units.

Outline of the new energy efficiency standards

The new energy conservation standards expect magnetic disk units with high energy consumption to improve the energy consumption efficiency by about 68% compared with the actual values (on a shipment basis) in FY2015. “Magnetic disk units with high energy consumption” refer to those on which “12 or more” disk drives can be mounted and in which the external dimensions of the disk drives have structures containing 3.5-inch disk drives, i.e., those with a width of over 75mm.

Number of mountable disk drives Styles and performance of disk drives
 
Standard energy consumption calculation formulae
External dimensions of disk drives Number of disks
1 - 1 E=exp(2.98×ln(N)-30.8)
2 or 3 E=exp(2.98×ln(N)-31.2)
4 or more E=exp(2.11×ln(N)-23.5)
2 to 11 - - E=exp(1.56×ln(N)-17.7)
12 or more Having structures containing 3.5-inch disk drives (with a width of over 75mm) - 0.00170
Having structures consisting of 2.5-inch disk drives alone (with a width of 75mm or less) - E=exp(0.952×ln(N)-14.2)
Notes:
E: Energy efficiency standards (unit: watt/gigabyte)
N: Number of revolutions (unit: rate per minute)
In:  Logarithm having “e” as the base

Reference: Examples of magnetic disk units

Source of pictures: Japan Electronics and Information Technology Industries Association

*Notes:
1. The Working Group on Classification Standards for Computers and Magnetic Disk Units of the Energy Efficiency and Conservation Subcommittee of the Committee on Energy Efficiency and Renewable Energy under the Advisory Committee for Natural Resources and Energy
2. Report (on classification standards for magnetic drive disks, etc.) compiled by the Working Group on Classification Standards for Computers and Magnetic Disk Units of the Energy Efficiency and Conservation Subcommittee of the Committee on Energy Efficiency and Renewable Energy under the Advisory Committee for Natural Resources and Energy

Related Material:

Division in Charge

Energy Efficiency Division, Energy Efficiency and Renewable Energy Department, ANRE