Can I make Storage work thru two USB hubs?
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From: mike on 23 Jan 2010 12:22 Can I make Storage work thru two USB hubs? Windows7 ultimate Dell Dimension 4600 I need more usb ports and have exhausted my options for internal ports. I have a universal flash memory card reader with 4 card slots. I think that means it has its own internal usb hub? It works flawlessly when connected to a USB2.0 port on the PC. If I run it thru a usb hub, I get random lockups during data writes. Works for small files and for about a dozen 4MB music files before it locks up. When it locks up, all four card slots disappear from the drive list until I unplug/replug the card reader. Removal policy is set at the default to defeat write cache. I have no trouble with a usb2 thumb drive accessed through the hub. Symptoms point to a problem when two hubs are in series. I don't have the option to connect the card reader directly to the PC...other ports tied up on higher priority uses. Are there any tricks I can use to make this work? I'm thinking about writing a script to transfer only one file at a time to (maybe??) eliminate queuing issues. Ideas? Thanks,mike
From: Yousuf Khan on 23 Jan 2010 14:04 mike wrote: > Symptoms point to a problem when two hubs are in series. > > I don't have the option to connect the card reader directly > to the PC...other ports tied up on higher priority uses. > > Are there any tricks I can use to make this work? > I'm thinking about writing a script to transfer only > one file at a time to (maybe??) eliminate queuing issues. Have you tried adding an USB PCI card? Yousuf Khan
From: mike on 23 Jan 2010 15:09 Yousuf Khan wrote: > mike wrote: >> Symptoms point to a problem when two hubs are in series. >> >> I don't have the option to connect the card reader directly >> to the PC...other ports tied up on higher priority uses. >> >> Are there any tricks I can use to make this work? >> I'm thinking about writing a script to transfer only >> one file at a time to (maybe??) eliminate queuing issues. > > > Have you tried adding an USB PCI card? > > Yousuf Khan If you hadn't snipped my post, you'd have read, "> I need more usb ports and have exhausted my > options for internal ports. "
From: Arno on 23 Jan 2010 16:19 mike <spamme0(a)go.com> wrote: > Can I make Storage work thru two USB hubs? [...] It seems that the Microsoft USB implementation is not fault tolerant enough. Things that work on Linux without problem fail on different versions of Windows with the same hardware. So, no, it is likely not going to work with Windows. Although there seem to be some specific hubs around that can compensate for these shortcommings. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno(a)wagner.name GnuPG: ID: 1E25338F FP: 0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F ---- Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans
From: Cronos on 24 Jan 2010 02:32 Arno wrote: > It seems that the Microsoft USB implementation is not fault > tolerant enough. Things that work on Linux without problem > fail on different versions of Windows with the same hardware. > > So, no, it is likely not going to work with Windows. Although > there seem to be some specific hubs around that can compensate > for these shortcommings. > > Arno > I have 2 external USB HDDs connected via 2 hubs and have no such issue on XP or Win7. He didn't say if his hubs are self powered or not. You must use powered hubs for it to be reliable.
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