Seagate ST3320820SCE Acoustics, Fluid Dynamic Bearing FDB motor acoustics, Idle CE seek profile

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2.10Acoustics

Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). All mea- surements are consistent with ISO document 7779. Sound power measurements are taken under essentially free-field conditions over a reflecting plane. For all tests, the drive is oriented with the cover facing upward.

Note. For seek mode tests, the drive is placed in seek mode only. The number of seeks per second is defined by the following equation:

(Number of seeks per second = 0.4 / (average latency + average access time)

Table 6:	Fluid Dynamic Bearing (FDB) motor acoustics

		Idle*	CE seek profile

ST3750640SCE		2.8 bels (typ)	3.0 bels (typ)
ST3750840SCE		3.0 bels (max)	3.1 bels (max)

ST3500830SCE		2.8 bels (typ)	3.0 bels (typ)
		3.0 bels (max)	3.1 bels (max)

ST3400820SCE		2.7 bels (typ)	2.9 bels (typ)
		2.9 bels (max)	3.0 bels (max)

ST3320820SCE		2.7 bels (typ)	2.9 bels (typ)
		2.9 bels (max)	3.0 bels (max)

ST3300820SCE		2.5 bels (typ)	2.8 bels (typ)
		2.7 bels (max)	2.9 bels (max)

ST3250820SCE		2.5 bels (typ)	2.8 bels (typ)
		2.7 bels (max)	2.9 bels (max)

*During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and power to operational levels.

20	DB35.3 Series Serial ATA Product Manual, Rev. D

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Contents

DB35.3 Series Serial ATA Revision history Revision Date Sheets affected or commentsContents DB35.3 Series Serial ATA Product Manual, Rev. D List of Figures Page Introduction About the Serial ATA interface Drive specifications Specification summary tablesDrive specifications summary for 750 Gbyte models Drive specification ST3750640SCE ST3750840SCEDB35.3 Series Serial ATA Product Manual, Rev. D Drive specifications summary for 500 and 400 Gbyte models Drive specification ST3500830SCE ST3400820SCEFollowing web Drive specifications summary for 320 and 300 Gbyte models Drive specification ST3320820SCE ST3300820SCEDB35.3 Series Serial ATA Product Manual, Rev. D Drive specifications summary for 250 Gbyte models Drive specification ST3250820SCEInformation for your drive Formatted capacity Default logical geometryLBA mode Cylinders Read/write heads Sectors per track 16,383Recording and interface technology Physical characteristicsDrive specification 750GB 500GB 400GB 320GB 300GB 250GBStart/stop times Power specificationsSeek time Standby mode Operating power and currentIdle mode power DC power requirements Power modes Heads Spindle Buffer Power-management modes Active mode Conducted noiseIdle and Standby timers Idle modeSleep mode Environmental specifications Vibration Nonoperating shock Disc models4 Disc models Operating vibrationIdle CE seek profile AcousticsFluid Dynamic Bearing FDB motor acoustics Agency certification Electromagnetic immunityReliability FCC verification Korean RRLAustralian C-Tick N176 Environmental protection RoHS MCVPage Configuring and mounting the drive Handling and static-discharge precautionsConfiguring the drive Serial ATA cables and connectorsMounting dimensions-top, side and end view Drive mountingDB35.3 Series Serial ATA Product Manual, Rev. D Serial ATA Sata interface Hot-Plug compatibilitySignal Serial ATA device plug connector pin definitionsSerial ATA connector pin definitions Pin Function DefinitionCommand name Command code in hex Supported ATA commandsSupported ATA commands F4H Identify Device command Word Description ValueXx07H 159 160 ATA-reserved 0000H 254 255 Integrity word XxA5H Description if bit is set to Bit Word Bit WordSet Features command Set Features command valuesCode in features register A.R.T. command 3 S.M.A.R.T. commandsM.A.R.T. commands Technical Support InternetPresales Support Data Recovery Services Call Center Toll-free Direct dial Warranty ServiceData Recovery Services Authorized Service Centers Index RRL Sata DB35.3 Series Serial ATA Product Manual, Rev. D Page Seagate Technology LLC