Support and General Use > Hardware
iPod HELP! USB transfer rate is much slower on WinXP than in Win2K
mightybrick:
--- Quote from: saratoga on December 28, 2006, 09:27:19 PM ---WIndows 2000 enables disk write caching for USB disks by default, XP disables it by default. The reason your ipod seems so fast in 2000 is that when you copy something, it doesn't actually write it to the ipod right away, so transfers appear to be only limited by the speed of the source hard disk. You can enable it in the Device Manager, however doing so will make it easier to corrupt the file system on your Ipod if you remove it without unmatching it.
--- End quote ---
Is there any way this situation would be affected by having the ipod booted into the apple firmware? In WinXP, I consistently have fast transfers in the apple firmware, but slower transfers in Disk Mode. In Win2k the transfers are fast, regardless of Disk Mode or apple firmware.
mzenz:
Thanks Saratoga. I couldn't find the config option you mention in hard manager. Anyway, I tried for the first time transfering under the same conditions, but with the original Apple firmware and, trust me... it's lightspeed. So the computer side troubleshooting is out of the question. Why rockbox behaves like this?
mightybrick:
As stated earlier, this is all caused by Apple's emergency disk mode. Rockbox does not yet have a USB mode, so all USB transfers are all handled by either the Apple firmware or the Apple Disk Mode.
saratoga:
--- Quote from: mightybrick on December 29, 2006, 11:23:35 PM ---
--- Quote from: saratoga on December 28, 2006, 09:27:19 PM ---WIndows 2000 enables disk write caching for USB disks by default, XP disables it by default. The reason your ipod seems so fast in 2000 is that when you copy something, it doesn't actually write it to the ipod right away, so transfers appear to be only limited by the speed of the source hard disk. You can enable it in the Device Manager, however doing so will make it easier to corrupt the file system on your Ipod if you remove it without unmatching it.
--- End quote ---
Is there any way this situation would be affected by having the ipod booted into the apple firmware? In WinXP, I consistently have fast transfers in the apple firmware, but slower transfers in Disk Mode. In Win2k the transfers are fast, regardless of Disk Mode or apple firmware.
--- End quote ---
Transfers are slower in Rockbox the Retail. Caching hides this in Windows 2000 but not XP.
mzenz:
Alright, I'm just starting to get it. Now, putting it all together... you say that rockbox uses some sort of "secondary" method for USB transfers provided by the iPod harware and the main transfer method is only implemented by the original Apple firmware?
OK. If this is right, let me ask you a couple of questions: will Rockbox support that feature sometime soon? If not, I'd like to help. I'm a C/C++ programmer and improving this would be a valuable improvement...! (battery life improvement would be just as valuabe, though I supose it would be more complex to solve)
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