I've been offline for a while and noticed that disk drives have popped up as subjects a few times.
Let me try to cover a few things that came up.Green Power
ALL the disk drive manufacturers are going green on their new models, it is an industry wide commitment. If you don't like drives that support spinning down better get used to buying obsolete models.
The default to save power is Standby, not Sleep.
Sleep has multiple variations and connotations that are managed by commands, and only the extreme power-saver devices (portable) actively manage Sleep. Putting a drive to Sleep has to be a deliberate act because it will ignore commands, even Power On, unless the Sleep is reset.
In terms of power utilization, based on highest power first:
- Power Up
- Active aka Operating
Standby is simple, the drive is awake but the disks are not spinnning.
Going green may not save energy, and let me use the example of the latest mentioned drive (HDS721050CLA362) to illustrate.
As per http://www.eworldsale.com/hitachi-hd...902_39823.html
the startup current is (max. A) 1.5 (+5V), 2.0 (+12V) and Idle of 4.4W.
Since the Startup power is 31.5W max and the Idle power is 4.4W, if a drive goes into Standby more often than every 7 seconds it uses more power than if it stayed in Idle.
Conclusion: The minimum default time to go into Standby will be 8 seconds or longer.
Operating power on the HDT721050SLA360 was 8.2W and I have found nothing to indicate that the HDS721050CLA362 is any lower because the claims about being better are for "Idle power savings".
This drive is an excellent desktop performer but way more powerful than the recorder needs, and uses more Operating power than the factory installed 160GB drives.
A notebook drive or a 5400 rpm desktop drive has more than enough performance for a recorder and will consume less than half the watts (and way less heat).
That was a great tip about Newegg's sale, have ordered a couple for my desktops.Green Cycle Counts
The 2160 has no power control management, so discussion of Sleep is irrelevant, the only green functionality that affects the recorder is the drive's default behavior.
High Cycle Counts and short life are not synonyms. 2.5" drives have had high cycle counts for years, and nobody talks about them failing in 2 years. In fact, 2.5" drives tend to have a higher MTBF than desktop drives, so
Drive manufacturers build a product to meet the anticipated use. In the past, desktop drives had low cycle counts because they were not intended for use in a high cycle environment. Forced start/stops which jacked up the cycle counts caused premature death.
Going green has changed all that. Desktop drives which go into Standby and support Sleep have been designed for high cycle counts, because they are chartered to save power. Saving power translates to higher start/stop cycle counts.
bodhi78 wrote that "information we got about one of the WD 500GB drives (see previous posts), indicating that a lot of people have problem with this.
I disagree, as nothing on the web relates to our recorders. There is some hysteria about cycle counts, but much of it comes from people speculating that they expect failures. There are only a few applications in which problems may occur.
These applications are using software which polls the drives every 15-60 seconds with a media access command that forces the drive to spin up. This is a totally stupid thing to do, as drive availability can be checked with a non-media access command and not affect the power savings. However, this software was written in the days when it didn't matter, and now that desktop drives have gone green, that software will eventually be aged out. The interim cure is to increase the default to a longer period than the polling check with the WDIDLE3 utility.
Funai recorders do not poll, and they do not have power management, so the only thing that will affect the cycle count in our drives is the default power management of the vendor. That default will NOT be conducive to product failure, the vendors could not afford the warranty coverage.
Recommendation: You can't go wrong with the lowest wattage disk drive in your recorder. 2.5" is best, green desktops follow and only a really significant price benefit supports installing a good desktop performer of higher power.