power requirements of OSB flash drives
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From: Dan Lenski on 5 May 2008 13:08 On Sun, 04 May 2008 07:08:02 +0000, Hactar wrote: > In article > <aba68e1a-f336-458c-99b2-d4af30e2d9d4(a)m44g2000hsc.googlegroups.com>, Dan > Lenski <dlenski(a)gmail.com> wrote: >> How about this instead? Use 4 CompactFlash cards instead of USB >> drives. The hardware interface of CF is *identical* to ATA/IDE, so all >> you need is a passive mechanical adapter. > > That will do nicely. Or rather, would have done, since I've decided to > get a hacked Xbox instead. Yeah, not absolutely quiet, but pretty darn > close, and a whole lot cheaper. That works too :-) > (For future reference, that URL is the same as > http://cgi.ebay.com/_W0QQitemZ360047295141 ) > > Not sure the proposed motherboard has two channels, lemme check... yep, > it does. Does that adapter take up one 3.5" bay or two? I can't tell. Actually, those adapters are a *lot* smaller than a drive bay... you can even get 2-CF-to-IDE adapters that plug directly into the IDE header, with no cable in between. >> So, get 2 of these adapter ($8) and 4 16gb CF cards (about $280 if you >> go for the best deals). > > There are 32 GB cards out there. Here's one: > > http://www.newegg.com/Product/Product.aspx?Item=N82E16820183191 True, but the GB/$ sweet spot is currently at 8gb or 16gb. Wait a month or two and it'll change :-) > What's the reliability like on CF cards, assuming you don't write to > them often? Is it possible to make a RAID array of two devices, so that > when one goes bad the computer can tell which one it is? Reliability is good, even with a lot of writing. Wear leveling makes that pretty much a non-issue these days, at least in terms of endurance. Wear leveling can still cause write /performance/ to suffer. Sure, Linux can software-RAID them like practically any other block devices. Frankly, if it's just for storing MP3s, I would go with RAID 0 (striping, no redundancy) for 4X the speed of one card and 4X the capacity. But if you consider your data more valuable, RAID 5 is a good choice (would give 3X the capacity and 2-3X the speed). >> And then you have a flexible, RAID-able 64gb SSD. Of course, at this >> point you've basically reinvented the SSD, except that yours will be >> pretty slow unless you go for the fast and pricey CF cards... > > Naw, speed's not important in this application. I mean, _glacial_ is > bad, but anything reasonable is OK. Eh... cheap CF cards are *really* slow, like <1 MB/s write speed. RAID will help, of course. Dan
From: Hactar on 5 May 2008 18:08 In article <jaHTj.13355$GE1.2146(a)nlpi061.nbdc.sbc.com>, Dan Lenski <dlenski(a)gmail.com> wrote: > On Sun, 04 May 2008 07:08:02 +0000, Hactar wrote: > > > http://cgi.ebay.com/_W0QQitemZ360047295141 > > > > Not sure the proposed motherboard has two channels, lemme check... yep, > > it does. Does that adapter take up one 3.5" bay or two? I can't tell. > > Actually, those adapters are a *lot* smaller than a drive bay... you can > even get 2-CF-to-IDE adapters that plug directly into the IDE header, with > no cable in between. Cool. Even if they're 2-cards-per-3.5"-bay, if the case only has one bay and I need four cards, I'm out of luck though. But if they're nice and small, maybe I can fit four cards (2xforward + 2xbackward) in one bay... > > Is it possible to make a RAID array of two devices, so that > > when one goes bad the computer can tell which one it is? > > Sure, Linux can software-RAID them like practically any other block > devices. Frankly, if it's just for storing MP3s, I would go with RAID 0 > (striping, no redundancy) for 4X the speed of one card and 4X the > capacity. But if you consider your data more valuable, RAID 5 is a good > choice (would give 3X the capacity and 2-3X the speed). Yeah, recompressing 250+ CDs into MP3s would be a real pain, so it'd be nice to make the array mostly insensitive to card failure, at the expense of speed. I figure 50 GB=~300 CDs gives me some breathing room. -- -eben QebWenE01R(a)vTerYizUonI.nOetP http://royalty.mine.nu:81 LEO: Now is not a good time to photocopy your butt and staple it to your boss' face, oh no. Eat a bucket of tuna-flavored pudding and wash it down with a gallon of strawberry Quik. -- Weird Al
From: Hactar on 6 May 2008 17:08 In article <de54c766-29ef-4f6a-b28f-7fea0339b9e8(a)l64g2000hse.googlegroups.com>, Dan Lenski <dlenski(a)gmail.com> wrote: > On May 6, 12:08 am, ebenZERO...(a)verizon.net (Hactar) wrote: > > >http://cgi.ebay.com/ > > > > _W0QQitemZ320248029565QQihZ011QQcategoryZ41993QQssPageNameZWDVWQQrdZ1QQcmdZViewItem > > > > > (how do you get the short urls???) > > > > Manual trimming. Think a regular multi-argument URL, except s/?/_W0QQ/, > > s/&/QQ/, and s/=/Z/ . You only need _W0QQitemZwhatever, all the > > other args including title can go byebye. This must be a homebrew syntax, > > since TTBOMK nobody else does it that way. > > Wow, that is bizarre! Do they have some good reason to break standard > CGI parameter passing syntax, or are they just doing it to make their > URLs needlessly opaque?? 800-pound gorilla syndrome, methinks. I guess they figure they're big enough to make the rules. Or maybe some rogue copro-grammer saw some dubious benefit in doing it this way. -- -eben QebWenE01R(a)vTerYizUonI.nOetP http://royalty.mine.nu:81 "It can be shown that for any nutty theory, beyond-the-fringe political view or strange religion there exists a proponent on the Net. The proof is left as an exercise for your kill-file." -- Bertil Jonell
From: Daniel Lenski on 5 May 2008 21:29 On Mon, 05 May 2008 22:08:00 +0000, Hactar wrote: >> Actually, those adapters are a *lot* smaller than a drive bay... you >> can even get 2-CF-to-IDE adapters that plug directly into the IDE >> header, with no cable in between. > > Cool. Even if they're 2-cards-per-3.5"-bay, if the case only has one > bay and I need four cards, I'm out of luck though. But if they're nice > and small, maybe I can fit four cards (2xforward + 2xbackward) in one > bay... The specs on the auction show them as being 7x6.3x1.2 cm without cards, so it won't be a problem... although may be a little messy with the cables, so you might prefer the version that plugs directly into the IDE header, if you have the clearance for it: http://cgi.ebay.com/ _W0QQitemZ320248029565QQihZ011QQcategoryZ41993QQssPageNameZWDVWQQrdZ1QQcmdZViewItem (how do you get the short urls???) Also, this is pretty cool, it's a 4-drive IDE controller card that takes 4 CF cards, in one PCI slot! http://www.addonics.com/products/flash_memory_reader/ad4cfprj.asp >> Sure, Linux can software-RAID them like practically any other block >> devices. Frankly, if it's just for storing MP3s, I would go with RAID >> 0 (striping, no redundancy) for 4X the speed of one card and 4X the >> capacity. But if you consider your data more valuable, RAID 5 is a >> good choice (would give 3X the capacity and 2-3X the speed). > > Yeah, recompressing 250+ CDs into MP3s would be a real pain, so it'd be > nice to make the array mostly insensitive to card failure, at the > expense of speed. I figure 50 GB=~300 CDs gives me some breathing room. Seems reasonable! Four 16gb cards will give you 48gb, would be a pretty nice setup. Dan
From: Hactar on 6 May 2008 00:08
In article <NvOTj.1772$nW2.582(a)nlpi064.nbdc.sbc.com>, Daniel Lenski <dlenski(a)gmail.com> wrote: > On Mon, 05 May 2008 22:08:00 +0000, Hactar wrote: > >> Actually, those adapters are a *lot* smaller than a drive bay... you > >> can even get 2-CF-to-IDE adapters that plug directly into the IDE > >> header, with no cable in between. > > > > Cool. Even if they're 2-cards-per-3.5"-bay, if the case only has one > > bay and I need four cards, I'm out of luck though. But if they're nice > > and small, maybe I can fit four cards (2xforward + 2xbackward) in one > > bay... > > The specs on the auction show them as being 7x6.3x1.2 cm without cards, > so it won't be a problem... although may be a little messy with the > cables, so you might prefer the version that plugs directly into the IDE > header, if you have the clearance for it: > > http://cgi.ebay.com/ > _W0QQitemZ320248029565QQihZ011QQcategoryZ41993QQssPageNameZWDVWQQrdZ1QQcmdZViewItem > > (how do you get the short urls???) Manual trimming. Think a regular multi-argument URL, except s/?/_W0QQ/, s/&/QQ/, and s/=/Z/ . You only need _W0QQitemZwhatever, all the other args including title can go byebye. This must be a homebrew syntax, since TTBOMK nobody else does it that way. > Also, this is pretty cool, it's a 4-drive IDE controller card that takes > 4 CF cards, in one PCI slot! > > http://www.addonics.com/products/flash_memory_reader/ad4cfprj.asp Nifty. Chipset supported by Linux? -- "Never go off on tangents, which are lines that intersect a curve at only one point and were discovered by Euclid, who lived in the 6th century, which was an era dominated by the Goths, who lived in what we now know as Poland." - from Nov. 1998 issue of Infosystems Executive. |