I don't think read/write and idle power specifications are going to be all that useful. These specifications are related to average demand not peak demand. The question that needs to be answered is, will the power supply be able to supply the peak (instantaneous) current demands of the hard drive. If it can't and goes into current limiting, a supply output will drop (go out of regulation) and continued operation of the net5501 and hard drive is no longer guaranteed.
Hard drive manufactures supply very detailed data on their drives in OEM specifications that are roughly 300 pages long. In these documents are specifications of the worst-case (maximum) current demand for each supply (usually just +5 and +12). This is the information one needs to understand the actual power supply requirements. At this time the only manufacture who makes the OEM specification available on their website is Hitachi. Several years ago, I called Western Digital and requested a paper copy of an OEM specification. But as far as I can tell WD does not supply this on their website. I have found Samsung to be nearly completely opaque. When I call Samsung support (United States), the only people I was able to speak with had no technical knowledge of their products. I am sure that Samsung has offices that work with industrial customers, but I have not succeeded in contacting them. One possible solution would be to find a Hitachi drive with similar specification to the HD204UI. This would give some idea of the current requirements. A similar Hitachi product from the 5K3000 series is the HDS5C3020ALA632. The OEM specification for this drive can be found at: http://www.hitachigst.com/tech/techlib.nsf/techdocs/3B466EACAD15AD4E8825781D00360E58/$file/DS5K3000-2TB_CS5K2000_OEM_manual_1.0.pdf I have a Samsung HD204UI here. It is a wonderful drive with very low average power requirements. If it is useful I could make some supply current measurements. This would be done with an oscilloscope and would show the peak currents when the drive was performing various operations. That it is easier to go to the trouble to measure this rather then get the information from the manufacturer makes me wonder why they call this the "information age". Part of this problem may be that there are many individuals who buy hard drives and manufactures need to isolate their industrial support people from the high volume of requests for information from individuals. -- Gavrik On Mon, Jul 4, 2011 at 7:32 AM, Muffinman <[email protected]> wrote: > > Thanks for your suggestion but I see this as a last resort. I want to > have an all-in-one system to which I hook up my usb-dac. I would like it > to be sort-off portable without too much fuss and wires. Secondary to > this, I'm afraid the error checking is less reliable over tcp/ip > compared to sata. I haven't extensively checked out this last point so I > not sure whether this fear is correct and if so, to what extent this > might affect the quality of the stream. However, considering my first > point I first want to see whether my original plan is feasible. > > According to the Soekris wiki the WDC WD1000FYPS 1000GB should work. > However, I've already got the Samsung HD204UI drive, so I would prefer > not to have to buy a new drive ... Luckily I have gained some searching > skills in the last couple of minutes and I have some data on the power > consumption. Compared to the WDC drive, the Samsung consumes during > read/write 1W less and during idle 1W more. In theory I guess it should > work out fine, though experience tell manufactures can be quite creative > with numbers. > > Kind regards, Maarten > > > On 04-07-11 15:21, Frank Schuhmann wrote: > > Hello Maarten, > > > > is perhaps a 24/7/365 day proven, external NAS system a choice or the > > solution > > for you? > > > > You only have to connect the NAS to one or two LAN Port´s of the net5501 > > that’s > > simple, but it brings still other cost for this device to you, but you have > > no > > more space problem, no overheating problem at all and don´t must hurt this > > smooth and pretty looking box. But the best after all is, you are able to > > buy an > > NAS that’s bringing up the capability´s to you, to using more HDD´s with > > greater > > volumes and then you only have to mount the volumes in your system! > > > > > > ____________________ > > > > Best regards and wishes > > > > Frank Schuhmann > > > > > > -----Original Message----- > > From: Maarten Koster [mailto:[email protected]] On Behalf Of Muffinman > > Sent: Monday, July 04, 2011 11:02 AM > > To: [email protected] > > Cc: [email protected] > > Subject: Re: [Soekris] Net5501 + Samsung HD204UI 3.5" hdd + 1 slot standard > > case > > > > Very nice indeed, unfortunately 2.5" hdd don't go further than 1TB as > > far as I know (and I need 2TB) and are much more expensive. I know the > > issues with heat complicate matters a bit, but if the hdd can be powered > > by the board, I'll find a solution for that somehow. > > > > Kind regards, Maarten > > > > On 04-07-11 07:26, Frank Schuhmann wrote: > >> Hello to Everybody, > >> > >> @ Maarten > >> > >> Perhaps you will think about to use a 3,5´ HDD and have an eye shot on > >> www.soekris.com under spare part section and see the pretty 2,5´ HDD > >> mounting > >> kit that fits exactly on your board. > >> > >> > >> > >> ____________________ > >> > >> Best regards and wishes > >> > >> Frank Schuhmann > >> > >> > >> -----Original Message----- > >> From: [email protected] > >> [mailto:[email protected]] On Behalf Of Muffinman > >> Sent: Sunday, July 03, 2011 3:26 PM > >> To: [email protected] > >> Subject: [Soekris] Net5501 + Samsung HD204UI 3.5" hdd + 1 slot standard > >> case > >> > >> Dear all, > >> > >> I was wondering if anyone knows whether the Net5501 can supply enough > >> power to feed a Samsung Ecogreen F4 HD204UI 3.5" hdd (if it helps, I > >> believe it has a Acoustic Management setting which, beside making it > >> quieter, I presume also would make it more energy efficient). > >> Unfortunately I couldn't find any additional info on it's power > >> consumption. > >> > >> In addition I am wondering if anyone has the 1 slot standard case for > >> this board and can tell me whether a 3.5" hdd would fit next to the > >> board (mounting the HDD with a bit of creativity). > >> > >> Thanks in advance, Maarten > >> _______________________________________________ > >> Soekris-tech mailing list > >> [email protected] > >> http://lists.soekris.com/mailman/listinfo/soekris-tech > >> > >> __________ Hinweis von ESET NOD32 Antivirus, Signaturdatenbank-Version 6262 > >> (20110703) __________ > >> > >> E-Mail wurde gepr|ft mit ESET NOD32 Antivirus. > >> > >> http://www.eset.com > >> > >> > >> > >> > >> __________ Hinweis von ESET NOD32 Antivirus, Signaturdatenbank-Version 6262 > >> (20110703) __________ > >> > >> E-Mail wurde geprüft mit ESET NOD32 Antivirus. > >> > >> http://www.eset.com > >> > >> > >> > >> > >> __________ Hinweis von ESET NOD32 Antivirus, Signaturdatenbank-Version 6262 > >> (20110703) __________ > >> > >> E-Mail wurde geprüft mit ESET NOD32 Antivirus. > >> > >> http://www.eset.com > >> > >> > > __________ Hinweis von ESET NOD32 Antivirus, Signaturdatenbank-Version 6262 > > (20110703) __________ > > > > E-Mail wurde geprüft mit ESET NOD32 Antivirus. > > > > http://www.eset.com > > > > > > > > > > __________ Hinweis von ESET NOD32 Antivirus, Signaturdatenbank-Version 6264 > > (20110704) __________ > > > > E-Mail wurde geprüft mit ESET NOD32 Antivirus. > > > > http://www.eset.com > > > > > > _______________________________________________ > > Soekris-tech mailing list > > [email protected] > > http://lists.soekris.com/mailman/listinfo/soekris-tech > > > _______________________________________________ > Soekris-tech mailing list > [email protected] > http://lists.soekris.com/mailman/listinfo/soekris-tech _______________________________________________ Soekris-tech mailing list [email protected] http://lists.soekris.com/mailman/listinfo/soekris-tech
