We have five recorders, and as 3.5" upgrades are half the cost of the 2.5" already done on two of them, I started researching for upgrade possibilities that used less power than the factory installed HDDs.
The higher the Idle power the more heat a drive generates, and recorders spend more time at Idle than Operating mode. Dissipating heat may not be an issue if the recorder is on an open shelf and the recorder's fan is working. OTOH, the cabinet in our family room became so hot inside that I installed a pair of temperature-controlled fans at the rear. After both recorders were upgraded to 2.5" 500GB drives with an Idle power spec of 0.85W the in-cabinet temperature has dropped to the point where the fans seldom operate any more.
Heat is generated in direct proportion to power used, and according to
http://ixbtlabs.com/articles2/storage/hddpower.html "Each one-degree [celsius] drop of HDD temperature is equivalent to a 10% increase of HDD service life". We all have a vested interest in extending the life of our recorders, and HDD power is something we can control to achieve that.
The best way to reduce a 3.5" drive's power profile is to use a manufacturer's utility e.g. Hitachi's Feature Tool. FT allows a user to set generic operational parameters of the ATA Set Features command, and works on all manufacturer's drives except Samsung (which has its own utility). The Set Feature AAM (Automatic Acoustic Management) function has 128 granular settings. The lowest setting can cut operational power consumption by up to 20%, which means less heat and a lower draw on the power supply. Since the actual effect of an AAM setting is vendor-dependent, there is no way of knowing whether AAM can knock the power usage of 500GB drives to below that of 160GB drives. Note: Thanks to tmwalsh0 I have learned that Hitachi dropped AAM support in Rev 2.13 but fortunately, 2.11 is still available at other sites e.g.
http://www.ddown.org/2008/08/05/ibm-...ture-tool-211/
SamOntario's install of a 640GB WD6400AACS drew my attention to Western Digital's line of Green HDDs that spin at or around 5400 rpm and use about 2/3 the power of desktop PC HDDs. According to comments on the web the Green drives are silent (good) and sluggish (bad) in a boot drive and as the Funai is not a boot drive, the latter is not a concern.
Hitachi's datasheets of CinemaStar (HC prefix) low-power HDDs specify maximum startup power, not Operating mode power. CinemaStar drives are not as readily available as WD Green, and only a few examples are included in the table with a * instead of OpW.
21 of 24 WD's Green drives up to 2TB in capacity use less power in both Operating and Idle modes than the factory-installed drives. Remember that no matter which drive you install, the usable capacity is limited to 500GB.
The AA and EA drives are PC desktop, the AV and EV drives are AudioVisual. WD's AV series was designed for video treaming/editing applications in design studios. WD chose to cater to the video editing companies with the AV line and pushed for the AV commands in the ATA standard. There is far more to the AV series than reduced power, there are error handling differences for the intended applications. WD write that the AV line is
"Designed for demanding audio and video environments", and the Funai is anything but a demanding environment. Since there is no benefit to the AV drives over the PC desktop models, go with the cheapest you can find on the day you decide to upgrade.
Code:
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Power Specs of Factory-Installed PATA Drives
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Size Model # OpW IdleW
160 ST3160215ACE 5.0 4.8
160 HDP725016GLAT80 6.1 3.3
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Specs of Low Power High Capacity SATA Drives
Size Model # OpW IdleW H x W x D in. H x W x D mm
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500 HCS5C1050CLA382 *1 2.9 1.030 x 4.00 x 5.787 26.1 x 101.6 x 147
500 HCS545050GLA380 *1 3.2 1.030 x 4.00 x 5.787 26.1 x 101.6 x 147
500 HCT721050SLA380 *1 4.4 1.030 x 4.00 x 5.787 26.1 x 101.6 x 147
500 WD5000AACS 5.4 2.5 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
500 WD5000AADS 6.0 3.7 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
500 WD5000AADS *2 4.1 2.2
500 WD5000AVDS 5.4 2.5 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
500 WD5000AVVS 5.4 2.5 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
640 WD6400AACS 5.4 2.5 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
640 WD6400AADS 6.0 3.7 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
640 WD6400AADS *2 4.9 2.8
640 WD6400AARS 4.9 4.5 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
640 WD6400AVVS 5.4 2.5 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
750 WD7500AACS 5.4 2.8 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
750 WD7500AADS 6.0 3.7 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
750 WD7500AADS *2 4.9 2.8
750 WD7500AVDS 5.4 2.8 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
750 WD7500AVVS 5.4 2.8 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
800 WD8000AARS 4.9 4.5 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
1000 HCS5C1010CLA382 *1 3.3 1.030 x 4.00 x 5.787 26.1 x 101.6 x 147
1000 WD10EACS 5.4 2.8 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
1000 WD10EADS 5.4 2.8 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
1000 WD10EADS *2 4.9 2.8
1000 WD10EVDS 4.9 4.2 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
1000 WD10EVVS 5.4 2.8 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
2000 WD15EADS 6.0 3.7 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
2000 WD15EARS 6.0 3.7 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
2000 WD20EADS 6.0 3.7 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
2000 WD20EARS 6.0 3.7 1.028 x 4.00 x 5.787 26.1 x 101.6 x 147
*1 Hitachi maximum startup power falls into the 18-26W range
*2 Power improvement introduced on drives manufactured in 1Q 2010
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Power Specs of Typical Desktop PC 500GB Drives
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PATA ST3500830ACE 8.2 9.3
PATA HDP725050GLAT80 7.9 4.5
SATA HDT721050SLA3x0 8.2 4.4
SATA HDP725050GLA3x0 8.2 4.8
SATA ST3500418AS 6.6 5.0
SATA WD5000AAKS 8.8 8.4
SATA WD5002ABYS 8.3 7.7
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The last table is for comparison purposes, and shows that the typical 500GB PC-class drives have power needs that far exceed the factory install. It is worth noting that those members who upgraded with such drives have not yet reported encountering any issues as a conseqence of doing so.
Some concerns have been expressed on the web about using the WD Green drives in RAID applications because SMART reports high cycle counts. It is more speculation than reports of failures, and it occurs because Green drives adopted the techniques of 2.5" drives to reduce power usage. The only 500GB WD Green which has been reported as being of concern is the AADS model. WD has info in their FAQ and a utility to resolve the issue.
http://wdc.custhelp.com/cgi-bin/wdc....p?p_faqid=5357http://wdc.custhelp.com/cgi-bin/wdc....p?p_faqid=3263WD drives are designed to reduce power consumption, in part by positioning the heads in a park position (unloading the heads) and turning off unnecessary electronics, resulting in substantial power savings. WD defines this mode as Idle 3.
Unix or RAID applications which poll the availability of a drive by issuing a media access command to the disk every 30 seconds are going to trigger a power cycle condition because the Green drive default is to go to Standby after 8 seconds of inactivity. The WDIDLE3.EXE utility lets these users to disable the timer, or set it to any value between 8 and 300 seconds.
WD allowed for higher cycle counts in the design of the drives. The typical cycle count on 3.5" PC drives is 50,000 takeoffs/landings. The Green drives are spec'd at 300,000 and WD claims that the
"drive has been validated to 1 million load/unload cycles without issue".
The power savings are real and relieve the risk of higher wattage large capacity drives causing the Funai power supply to fail. Heat kills electronics, and these Green drives are way cooler than any other high capacity drive, especially at Idle which is where the Green drives excel.
An objective perspective comes from the drive data recovery companies, which are not seeing high incidents of failure in WD Green drives. In fact, dataclinic writes
"Courtesy of perpendicular recording methods, Western Digital's 'GreenPower' hard drives offer large storage capacities, low power consumption & good general reliability."
Warning: One reservation that applies to all new SATA models does not relate to power saving techniques, but to sector size. Drive vendors have been planning to migrate from 512 to 4096 byte physical sectors for a long time. On drives that have 4096 byte sectors, odd-boundary 512-byte transfers require manipulation. In the Green drive series only the EARS drives are "Advanced Format".
OS vendors have had years to prepare for this shift but in typical ostrich fashion have chosen to ignore it. Read
http://hothardware.com/Articles/WDs-...Pay-Attention/ for a wakeup call.
The large sector drives can simulate 512-byte operation by doing sector manipulation, and that can slow things down. It would be best to avoid using them in the Funai recorders.