Question about External HD
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From: Erik Richard Sørensen on 24 Jan 2010 16:55 Larry Gusaas wrote: > On 2010/01/24 11:36 AM Erik Richard Sørensen wrote: >> You can say that the 'Seagate situation' is the opposite of the >> 'IBM/Hitachi situation', where the 2.5" IBM/Hitachi TravelStar always >> have b een among the best, the 3,5" disks are among the worst. So as >> already written buy a WD Scorpio or TravelStar > > Unfortunately, I got one of the duds when I bought a Hitachi TravelStar > 320GB 7200rpm HD. It died after five months. What really irritated me > was waiting over a month for a replacement drive to arrive. > > Because of the long replacement time, I probably won't get another > Hitachi drive. How long are Seagate's replacement times? I think it's about the same time, but may vary depending on where you're living... And yes, there have been a few series of the 7200rpm 5K and 6K series disks from Hitachi that were - hm... bad is a bit too mild a word, but you can replace it with a stronger.:-) - But so far I haven't seen any from the newest 7K series with so bad failures - mostly the first ones got rather warm and noisy, but they kept working... Cheers, Erik Richard -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Erik Richard Sørensen, Member of ADC, <mac-manNOSP(a)Mstofanet.dk> NisusWriter - The Future In Multilingual Text Processing - www.nisus.com OpenOffice.org - The Modern Productivity Solution - www.openoffice.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
From: Erik Richard Sørensen on 24 Jan 2010 17:31 M-M wrote: > Erik Richard Sørensen <NOSPAM(a)NOSPAM.dk> wrote: >> Until now I've _never_ seen a MBP without Firewire! > > I can't see much difference in trnsfer speed between a FW400 and a good > USB drive like my Lacie Little Disk. This MBP only comes with a FW800 > and I really dislike the connector plug and jack. It falls out too > easily. Theoretically seen the USB 2.0 with it's 480mbit should be faster than the FW400 with it's only 400mbits transfer speed. But I can guarantee you that both FW400 speed and not at least stability is far beyound the USB. Don't forget that one could say that the USB signal is a 'routed signal', which in rough terms mean that each time you move the mouse, type on the keyboard, using your printer, etc., the transfer speed will be affected, where a FW signal - again roughly said - is a 'independant parallel circuit' signals, which don't slow down the transfer speed. - Real time measuring gives an apprx. 35-45% higher transfer rate on FW400 than on USB 2.0 - especially when copying folders containing many - thousands - of smaller files. I have a folder with apprx. 24.000 icon files that I always use as a test, when testing transfer speeds on USB towards FW400 and/or FW800 Transfer speed: Folder Transferred via USB 2.0HighSpeed (MacPro) to external disk apprx. 2:40 hours. Folder Transferred via FW400 (MacPro) to external disk apprx. 37 mins.Folder Transferred via FW800 (MacPro) to external disk apprx. 16 mins. The same folder but now made into a compressed apprx. 2,6gb .dmg file: DMG file Transferred via USB 2.0HS (MacPro) to external disk apprx. 5:50 mins. DMG file Transferred via FW400 (MacPro) to external disk apprx. 3:45 mins. DMG file Transferred via FW800 (MacPro) to external disk apprx. 2:20 mins. And here you should think of that the OS X is built of lots and lots of smaller independant files that are 'called' each at the time needed, and when/if many smaller files are been called by the system, the 'transfer' = read/write signal from the CPU to/from the external disk will be slowed by the many files. The same 'calling' also happens when using FW, but the read/write time is 'static' and quite a lot higher with Firewire. Cheers, Erik Richard -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Erik Richard Sørensen, Member of ADC, <mac-manNOSP(a)Mstofanet.dk> NisusWriter - The Future In Multilingual Text Processing - www.nisus.com OpenOffice.org - The Modern Productivity Solution - www.openoffice.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
From: Erik Richard Sørensen on 24 Jan 2010 17:36 nospam wrote: > M-M <nospam.m-m(a)ny.more> wrote: >> I can't see much difference in trnsfer speed between a FW400 and a good >> USB drive like my Lacie Little Disk. This MBP only comes with a FW800 >> and I really dislike the connector plug and jack. It falls out too >> easily. > > get a better cable. Of course a double-shielded high-capacity and very short USB cable may increase speed a bit, but my guess is that it won't be much... Cheers, Erik Richard -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Erik Richard Sørensen, Member of ADC, <mac-manNOSP(a)Mstofanet.dk> NisusWriter - The Future In Multilingual Text Processing - www.nisus.com OpenOffice.org - The Modern Productivity Solution - www.openoffice.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
From: Jolly Roger on 24 Jan 2010 20:31 In article <nospam.m-m-2929A4.11364324012010(a)cpe-76-190-186-198.neo.res.rr.com>, M-M <nospam.m-m(a)ny.more> wrote: > In article <jollyroger-65A1E0.10053024012010(a)news.individual.net>, > Jolly Roger <jollyroger(a)pobox.com> wrote: > > > In my book it's Seagate > all others. Of course that's just my opinion, > > and you know what they say about opinions. : ) > > I have been reading that the Seagate 7200 2.5" drives have some serious > reliability issues that may or not have been fixed with a firmware > update: > > http://www.amazon.com/Seagate-Barracuda-ST3320613AS-Bare-Frustration-Free > -Packaging/product-reviews/B001VKYA5Y/ref=cm_cr_pr_hist_1?ie=UTF8&showVie > wpoints=0&filterBy=addOneStar You can find similar reports about just about every hard drive manufacturer in existence. All manufacturers make mistakes, and all of them have bad batches or drives from time to time. It's the nature of the business. Seagate drives are certainly among the most reliable in my experience. -- Send responses to the relevant news group rather than email to me. E-mail sent to this address may be devoured by my very hungry SPAM filter. Due to Google's refusal to prevent spammers from posting messages through their servers, I often ignore posts from Google Groups. Use a real news client if you want me to see your posts. JR
From: nospam on 24 Jan 2010 21:19
In article <4b5cca5e$0$8548$ba624c82(a)nntp06.dk.telia.net>, Erik Richard S�rensen <NOSPAM(a)NOSPAM.dk> wrote: > each time you move the mouse, > type on the keyboard, using your printer, etc., the transfer speed will > be affected, only if you have they keyboard/mouse on the *same* usb bus as the drive. that's normally not the case. the keyboard is usually plugged into the mac itself, with the mouse plugged into the keyboard. a usb hard drive is then plugged into another usb port on the mac. they're separate. |