Date: Thu, 8 Feb 2007 10:44:33 -0500 From: "Constantine A. Murenin" <mureninc@gmail.com> To: Fluffles <etc@fluffles.net> Cc: Andrew Pantyukhin <infofarmer@freebsd.org>, rsh <bsdgroup.md@gmail.com>, freebsd-hardware@freebsd.org Subject: Re: External HDD Message-ID: <f34ca13c0702080744x2d989efev1c914dd892fd0952@mail.gmail.com> In-Reply-To: <45CB391F.6070903@fluffles.net> References: <1170861895.87827.8.camel@localhost> <45CA1107.1020609@fluffles.net> <cb5206420702070958n1b02c5b2w3320ebd779c09791@mail.gmail.com> <45CB2DE8.1090609@fluffles.net> <cb5206420702080629p237800f2xc80c1c3f3554f3f0@mail.gmail.com> <45CB391F.6070903@fluffles.net>
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On 08/02/07, Fluffles <etc@fluffles.net> wrote: > Andrew Pantyukhin wrote: > > BTW, many 2,5" enclosures I've seen require two usb > > ports, the second one just to get more power. > > Hm well with a Samsung drive you won't need an extra cable; at least not > with proper enclosure like i have. Works perfectly with one cable. Just because it works with one motherboard, doesn't mean it will work with another. :) Samsung drives are nothing special as far as power consumption goes, in fact, they consume more power AND they work slower than HGST drives do -- just check the specs. So in reality, you get much better performance per watt with HGST than with Samsung, as well as you can actually lower the wattage with HGST. :) [...] > >> > drives and I prefer using Seagate drives inside. > >> > >> Seagate gets rather hot; Samsung is a lot better in that respect. > > > I have a Sarotech Hardbox enclosure for 3.5" > > > > That's what I'm saying, Seagate is hot! But seriously, > > fanless enclosures are a problem with any drive. > > With a 2,5" Samsung drive you won't have any problems with heat; these > drives do 0,6W; very power-efficient i would say. Where have you got this figure from? Let's just pick the first two cheapest Samsung drives that are available at NewEgg.com [0]: http://www.samsung.com/Products/HardDiskDrive/SpinPointMSeries/HardDiskDrive_SpinpointMseries_MP0402H_sp.htm http://www.samsung.com/Products/HardDiskDrive/SpinPointMSeries/HardDiskDrive_SpinpointMseries_MP0603H_sp.htm both of these Samsung drives require 5.0 W for spin-up, and then they consume 2.4 W on reads and writes, and 0.85 W on low-power idle, and their maximum media transfer rate is 431Mbit/s. (I.e. even their read/write wattage barely fits into the 2.5W allowance of a single USB port, but remember that the enclosure itself consumes some of that 2.5 W, too...) Now let's take a look at the first two cheapest HGST drives on newegg.com, which actually come from a single HGST series -- these HGST drives have the same 5400 RPM and size parameters as the above Samsung drives, and their prices are only 2 USD apart from the Samsung counterparts: http://www.hitachigst.com/hdd/support/5k100/5k100.htm and we can see that the 5K100 series, which is a rather old one BTW, consumes also 5.0 W on start-up, but only 2.0 W on reads and writes, with low-power idle at 0.60 W, and their maximum media transfer rate is 493Mbit/s. I.e. better in all aspects from the above Samsung drives. And the new 5k120 series has even better characteristics than 5k100. [0] http://www.newegg.com/Product/ProductList.asp?Submit=ENE&N=2010150380&Subcategory=380
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