Re: External hard drive problem
From: Pete (lansma_at_bigpond.com)
Date: 12/03/04
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Date: Fri, 03 Dec 2004 13:27:48 GMT
Thanks, you've been a big help. I have tried to alter the policies
without a change in the problem. I have just posted to the Dell
peripherals forum. I don't think I am alone in having firewire problems
it seems.
One FINAL question: do the read/write speeds I reported sound within
normal limits?
Again, many thanks.
-- All the best, Pete ------------------------------------------------ Home Page: http://users.bigpond.com/lansma Location: 42°53'S; 147°19'E R. McCarty wrote: > I wasn't aware that your PC was a notebook. In that case, then > both USB ports are 2.0 (High Speed). > > As to the Firewire connection experiencing Delayed write failures > it could be due to the Polices on the drive. I have a Maxtor external > USB drive. Whenever it is connected, it's Device Manager policy is > set to "Optimize for Quick Removal" which doesn't use delayed writes. > You should connect via both technologies and go to Device Mgr & > click the Policies Tab and see how the caching is set in each setup. > Perhaps when you use Firewire, the disk cache can't flush data fast > enough and that's why you are getting the error. > > "Pete" <lansma@bigpond.com> wrote in message > news:YEXrd.57179$K7.9164@news-server.bigpond.net.au... >> Thanks for that, but I remain confused. I have a Dell notebook and >> only have two USB ports. Doers this mean they are both USB 2.0 based >> on the info I provided above or just one of them? >> >> I have done some tests of read/write/and random access speeds for the >> USB 2.0 (?) port versus firewire. (It is only when I use firewire >> that I get the "Windows - Delayed Write Failed" problem). I'd >> welcome your feedback: >> >> Firewire >> ---------- >> Sequential Write: 22.4 Mbps >> Sequential Read: 29.4 Mbps >> Random Access: 16.7 Mbps >> >> USB >> ---------- >> Sequential Write: 23.3 Mbps >> Sequential Read: 24.3 Mbps >> Random Access: 12.8 Mbps >> >> Are these fairly typical rates? >> >> Thanks a million. >> >> -- >> All the best, >> Pete >> >> ------------------------------------------------ >> Home Page: http://users.bigpond.com/lansma >> Location: 42°53'S; 147°19'E >> >> >> >> R. McCarty wrote: >>> Yep - That's how most Intel Chipset 82801 Controller Hubs are >>> enumerated in Device Manager. Your PC should have 4 fixed USB >>> ports on the back plane, then two separate connectors. One for use >>> with front panel USB ports and the other to a PCI slot access. >>> Unfortunately, there isn't a software tool for diagnosing which type >>> of USB (Full -1.1 or HighSpeed 2.0) are present. Adaptec has one >>> called USB Control but it only works with Adaptec PCI Add-in USB >>> cards. >>> >>> Also, the ports aren't logically arranged - You need to change the >>> Device Manager default view to "View by Connection", then expand >>> the ACPI, ACPI Compliant System, PCI Bus, USB hubs and you can >>> see how actual devices are connected to which HUB by their >>> identifier (24C4, 24C2, etc). In other words USB ports 1 & 2, 3 & >>> 4, 5 & 6 don't always equate to the same Hub. It's confusing, but >>> helps if you have a heavily loaded HUB where power limits or >>> bandwidth are >>> an issue. >>> >>> "Pete" <lansma@bigpond.com> wrote in message >>> news:U2Ord.56559$K7.27512@news-server.bigpond.net.au... >>>> Thanks R., >>>> >>>> In Device Manager under Universal Serial Bus controllers I have 8 >>>> entries: >>>> >>>> Intel(r) 82801DB/DBM USB 2.0 Enhanced Host Controller - 24CD >>>> Intel(r) 82801DB/DBM USB Universal Host Controller - 24C2 >>>> Intel(r) 82801DB/DBM USB Universal Host Controller - 24C4 >>>> Intel(r) 82801DB/DBM USBUniversal Host Controller - 24C7 >>>> USB Root Hub >>>> USB Root Hub >>>> USB Root Hub >>>> USB Root Hub >>>> >>>> and if I plug my external drive in I get another entry: >>>> >>>> USB Mass Storage Device >>>> >>>> Does this smean my 2 x USB ports are 2.0? >>>> >>>> Thanks. >>>> >>>> >>>> -- >>>> All the best, >>>> Pete >>>> >>>> ------------------------------------------------ >>>> Home Page: http://users.bigpond.com/lansma >>>> Location: 42°53'S; 147°19'E >>>> >>>> >>>> >>>> R. McCarty wrote: >>>>> If the device is USB 2.0 capable and you plug it into a USB full >>>>> speed port (Version 1.1) XP will report that a USB2.0 (High Speed) >>>>> device is being used in a non-USB2 port. >>>>> Determine USB capability by the descriptor in Device Manager >>>>> for Universal Serial Bus Controllers by checking for "Enhanced >>>>> Controller" - which denotes USB Full Speed 2.0. >>>>> For benchmarking, I would use DiskSpeed 32 which can display >>>>> the important aspects of Burst, Sustained transfers and access >>>>> time - which shouldn't vary between Firewire and USB. >>>>> Disk Speed can be downloaded from: >>>>> http://www.geocities.com/vgrinenko/DiskSpeed32/ >>>>> >>>>> "Pete" <lansma@bigpond.com> wrote in message >>>>> news:2oMrd.56478$K7.18397@news-server.bigpond.net.au... >>>>>> Now, here's the thing: >>>>>> >>>>>> When connected using Firewire, I get the problems reported when >>>>>> trying the defrag but using USB 1.1 I don't. Well, at least I >>>>>> think it's 1.1 but it doesn't seem much slower than Firewire, if >>>>>> at all, which I think is strange. >>>>>> >>>>>> Does this offer further clues? >>>>>> >>>>>> Also, is there a way to check whether I have USB 1.1 vs USB 2.0? >>>>>> >>>>>> Finally, is there a way I can properly test the speed of the >>>>>> drive running USB versus Firewire - like a diagnostic tool I can >>>>>> download somewhere? >>>>>> >>>>>> Thanks again. >>>>>> >>>>>> -- >>>>>> All the best, >>>>>> Pete >>>>>> >>>>>> ------------------------------------------------ >>>>>> Home Page: http://users.bigpond.com/lansma >>>>>> Location: 42°53'S; 147°19'E >>>>>> >>>>>> >>>>>> >>>>>> Alex Nichol wrote: >>>>>>> Pete wrote: >>>>>>> >>>>>>>> "Windows - Delayed Write Failed >>>>>>>> Windows was unable to save all the data for the file G:????. >>>>>>>> The data has been lost. this error may be caused by a failure >>>>>>>> of your computer hardware or network connection. Please try to >>>>>>>> save this file elsewhere." >>>>>>>> >>>>>>>> I'm reasonably clueless about what to do in these situations >>>>>>>> but I did run the Windows XP disk error checking utility >>>>>>>> (which took literally a couple of hours). This did not report >>>>>>>> any problems. >>>>>>> >>>>>>> The best thing in such a case is to turn off the delayed write - >>>>>>> the loss is not in practice very much and better have it work >>>>>>> reliably. Go to >>>>>>> Control Panel - System - Hardware - Device Manager >>>>>>> look for the drive, double click and in the Policies page >>>>>>> uncheck 'Enable Write caching' >>>>>>> >>>>>>> I would also go to the USB controllers section, lower down and >>>>>>> look for the USB Root Hub that shows as being in use for this >>>>>>> device on its Power page. Then in its Power Management, uncheck >>>>>>> 'Allow computer to turn off to save power', which may well be >>>>>>> the underlying cause
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