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Subject: Re[2]: 1,8" HDD for ajb ?
From: RudiS (mailmetorudiS_at_gmx.ch)
Date: 2004-05-07


Hallo Roland,

Could you test your HD as well as in 4700m altitude ? :-D
Then my problem should be solved too.

RudiS

Am Donnerstag, 6. Mai 2004 um 18:06 schrieben Sie:

r> Hi!
r> Ordered a 1.8" Hitachi Travelstar C4K40 and got it delivered today.
>>From my first point of view:
r> works like a charm - and my feeling is, that my ajbrec is even more "responsive" -
r> i.e. when browsing/ffwing the songs, it seems to be a little bit quicker
r> than the 2.5" model i had before.
r> ssssiiiiiiiiiipp - much higher noise than a 2.5" hdd :)

r> now i need to watch out for the 5->3.3V power converter to save real power and
r> get really long runtime.... :)

r> btw: i wasn`t into "electronics" for some time now, could someone recommend
r> a good and cheap solution, to measure voltage/current with the pc (over a longer
r> time period) ?
r> a cheap multimeter with pc-interface with appropriate datalogging software ?
r> an a/d converter with usb interface and easy to use (turtle grahpics? ;) scripting?)
r> programming interface, to write your own datalogger ? i would probably buy such and
r> post the resulting current-diagrams. i don`t have my "conrad electronics" (german
r> radioshack equivalent) by hand - and browsing their website isn`t really fun.

r> regards
r> roland

r> ----- Original Message -----
r> From: "roland" <for_spam_at_gmx.de>
r> To: "Rockbox development" <rockbox_at_cool.haxx.se>; <idc-dragon_at_gmx.de>
r> Sent: Thursday, April 22, 2004 8:35 PM
r> Subject: Re: 1,8" HDD for ajb ?

>> > The Player/Recorder models use the battery voltage directly, not so easy
>> > there.
>> we would need an additional dc/dc-converter, right ?
>> these exist in form of integrated circuits and have very few power consumption.
>>
>> these ones
>> http://www.maxim-ic.com/appnotes.cfm/appnote_number/725
>> seem to be too "weak" for doing their job in an archos (hdd needs more current),
>> but maybe someone knows a cheap, powerful, low-power 5.0->3.3V converter-ic ?
>>
>> i think it`s difficult to give an estimation, how much power is being saved and
>> how much more runtime an ajb would get - but if it`s >3-4 hrs additional runtime,
>> i would probably buy such disk.
>> i did a quick compare - and it seems this hdd (at 3.3V) consumes half of the power
>> of an ordinary 2.5" hdd
>> so i think it`s worth to discuss further - isn`t it ?
>> changing the hdd to this model should probably give a SIGNIFICANT runtime benefit,
>> imho.
>>
>> regards
>> roland
>>
>>
>>
>> ----- Original Message -----
>> From: "[IDC]Dragon" <idc-dragon_at_gmx.de>
>> To: "Rockbox development" <rockbox_at_cool.haxx.se>
>> Sent: Thursday, April 22, 2004 10:36 AM
>> Subject: Re: 1,8" HDD for ajb ?
>>
>>
>> > > Wouldn`t that fit into an archos , giving even longer runtime ?
>> > >
>> >
>> http://www.hitachigst.com/tech/techlib.nsf/techdocs/4B0BCB1DB47911A386256D5500494CDC/$file/HGSTTravelstarC4K40.PDF
>> > > looks like a standard 2,5"hdd mechanical interface to me.
>> >
>> > Yes it will fit, these drives are mechanically like half a 2.5" drive. The
>> > connector end is the same.
>> > The supply is nominally 3.3V now, but also tolerates 5V at the cost of
>> > higher consumption.
>> > If mounted into an FM/V2, you could modify the supply to give less than 5V.
>> > Those models have a DC/DC converter to make 5V from the LiIon voltage which
>> > can then be bypassed.
>> > The Player/Recorder models use the battery voltage directly, not so easy
>> > there.
>> >
>> > Jörg
>> >
>> > --
>> > NEU : GMX Internet.FreeDSL
>> > Ab sofort DSL-Tarif ohne Grundgebühr: http://www.gmx.net/dsl
>> >
>> > _______________________________________________
>> > http://cool.haxx.se/mailman/listinfo/rockbox
>> >
>>

r> _______________________________________________
r> http://cool.haxx.se/mailman/listinfo/rockbox

-- 
Mit freundlichen Grüssen
RudiS                            

mailto:mailmetorudiS_at_gmx.ch

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