This Bug has me tearing my hair out.
It has been an issue for me for many years on two different machines & all distros since 8.04. I find it hard to accept that after all this time it remains unsolved. & the comments by some experienced users are really, very annoying. The initial 8.04 system that had the issue was an AMD Athalon system. However the functionality of Ubuntu has lead me to gradually transfer ever thing to the current machine Resulting in a monster that Linux handles with grace & aplomb.
MY Issue is that on any Fat 32 USB drive, large transfers of either large files or many small files. start at high speed the go into a stop small burst, stop small burst, mode. it affects all USB Thumb drives but the larger Newer drives will transfer bigger lumps faster before stalling e.g. an older 2G thumb drive will stall at approx 200meg & the new 32G Lexar drives pull down 480meg before stalling connecting the drive to a windoze virtualbox VM results in a steady transfer at USB1.1 speeds Usb hard drives fat32, NTFS, RIESERFS, EXT3 & EXT4 are unaffected.
Current system AMD PHENOM-2 X6 running 10.10 x64, 8G ddr2 memory, roughly 8 tb storage (1/3 on usb) with a copy of XP running SCADA Data collection & analysis 24/7 as a Virtual machine. A sweet heavily loaded system with one major issue that is really starting to bite me in the but. God forbid I have to migrate this monster back to Windoze!!!
Looking around I have come across many dozens of reports of this issue & no hint of a solution or indeed any real attempt to solve it.
While I am definitely no Linux Guru I certainly qualify as a long term power user & am not scared to dive in at the command prompt if someone has the patience to spell out what they need me to do or test, to get some traction on this issue. I am quite prepared to do what ever is needed & in my power to do.
Cheers all KG001