Magnetic Disk Units

Magnetic disk units, except the following:

1) Those with a memory capacity of 1 GB or less,

2) Those which only work based on direct-current power supply through data communication cable of USB cables, etc.

Energy consumption efficiency shall be a numeric value obtained by dividing power consumption (W) by memory capacity (GB).

1) FY2011 and each subsequent fiscal year (until FY2022)

In the target fiscal year and each subsequent fiscal year, for each category, the weighted average value obtained by weighting energy consumption efficiency with shipment volume shall not be above the target standard value which is a weighted average value obtained by weighting standard energy consumption efficiency*1 with shipment volume. ^*1: Values obtained from the standard energy consumption calculation formulas.

*1: Values obtained from the standard energy consumption calculation formulas.

Category					Standard energy consumption calculation formula
Type of magnetic disk unit	Shape and performance of magnetic disk unit	Revolution speed	Use	Category name
Single unit disk	Disk size exceeding 75 mm; 1 disk	―	―	A	E＝exp(2.98×ln(Ｎ)－30.8)
	Disk size exceeding 75 mm; 2 or 3 disks	―	―	B	E＝exp(2.98×ln(Ｎ)－31.2)
	Disk size exceeding 75 mm; 4 disks or more	―	―	C	E＝exp(2.11×ln(Ｎ)－23.5)
	Disk size exceeding 50 mm but not over 75 mm; 1 disk	5,000 rpm or less	―	D	E＝exp(2.98×ln(Ｎ)－29.8)
		Over 5,000 rpm but 6,000 rpm or less	―	E	E＝exp(2.98×ln(Ｎ)－31.2)
		Over 6,000 rpm	―	F	E＝exp(4.30×ln(Ｎ)－43.5)
	Disk size exceeding 50 mm but not over 75 mm; 2 or 3 disks	5,000 rpm or less	―	G	E＝exp(2.98×ln(Ｎ)－31.5)
		Over 5,000 rpm but 6,000 rpm or less	―	H	E＝exp(2.98×ln(Ｎ)－32.2)
		Over 6,000 rpm	―	I	E＝exp(4.58×ln(Ｎ)－46.8)
	Disk size exceeding 50 mm but not over 75 mm; 4 disks or more	―	―	J	E＝exp(2.98×ln(Ｎ)－31.9)
	Disk size exceeding 40 mm but not over 50 mm; 1 disk	―	―	K	E＝exp(2.98×ln(Ｎ)－30.2)
	Disk size exceeding 40 mm but not over 50 mm; 2 disks or more	―	―	L	E＝exp(2.98×ln(Ｎ)－30.9)
Subsystem	―	―	Ones for main frame server	M	E＝exp(1.85×ln(Ｎ)－18.8)
	―	―	Ones whose category name is not M	N	E＝exp(1.56×ln(Ｎ)－17.7)

Remarks:

‟Main frame server” refers to server type computers (computers designed to provide service and the like via a network) mounted with a dedicated CISC (which is, among CPUs designed to be able to execute multiple commands differing in the number of bits, ones each of which is designed for exclusive use per computer). E and N represent the following values, respectively. E: Standard energy consumption efficiency N: Number of revolutions (unit: per minute) In represents a logarithm having e as the base.

2) FY2023 and each subsequent fiscal year

In the target fiscal year and each subsequent fiscal year, for each category, the weighted average value obtained by weighting energy consumption efficiency with shipment volume shall not be above the target standard value which is a weighted average value obtained by weighting standard energy consumption efficiency with shipment volume.

Number of mountable disk drives	External dimensions of disk drives	Number of disks	Category names	Standard energy consumption calculation formulae
1	-	1	I	E＝exp(2.98×ln(N)-30.8)
		2 or 3	II	E＝exp(2.98×ln(N)-31.2)
		4 or more	III	E＝exp(2.11×ln(N)-23.5)
2 to 11	-	-	IV	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)	-	V	0.00170
	Having structures consisting of 2.5-inch disk drives alone (with a width of 75mm or less)	-	VI	E＝exp(0.952×ln(N)-14.2)

Remarks:

The letters “E” and “N” in the respective target standard values refer to the numerical values representing the following items. E: Energy efficiency standards (unit: watt/gigabyte) N: Number of revolutions (unit: rate per minute) The term “In” refers to logarithm having “e” as the base. When multiple disk drives with different revolution rates are mounted in one device, the revolution rate (N) should be the weighted average of the revolution rates of the respective disk drives based on the number of installed drives. Width should be the length of intermediate side of external dimensions

FY2011 and each subsequent fiscal year (until FY2022)

FY2023 and each subsequent fiscal year

Energy consumption efficiency of category V is expected to be improved by about 68% compared with the FY2015 level in the target fiscal year (FY2023).

●Product name and type

●Category name

●Energy consumption efficiency

●Memory capacity at maximum structure, number of revolutions of disks, numbers of disk drives each external dimensions of disk drive.
(limited to cases of category Ⅴ or category Ⅵ)

●Name of manufacturer, etc.

●Description of energy consumption efficiency

Display items shall be presented at locations where they can be readily noticed in catalogs showing performance indications and in documents provided by the manufacturer for product selection.

Manufacturers or importers whose annual manufacturing volume or importing volume (limited to shipment to the domestic market) is 5,000 units or more may be subject to recommendations and orders.