[Bug 392089] Re: Slow USB transfer for FAT32

[Ivan Terekhov]

Very strange results when trying to copy a 656MB file on a FAT32 SDHC
card through USB. And seems that it caused by the same issue with FAT32.

It starts copying pretty fast (at ~4MB/s), and after 30MB or so it starts to slow down, and down, and down...
After ~30 seconds it's ~1.5MB/s.
After first minute -  ~1MB/s.
After ~30 minutes - ~120KB/s, and newer gets better.
For test purposes I divided the same file into 10 MB pieces, and got them all copied in ~2 minutes.
Exactly the same results on another, freshly-formatted to FAT32 Kingston 8GB SDHC (class 6), so I can't blame fragmentation.
The same Transcend card reader with the same SDHC cards works perfectly under WinXP.

AMD Athlon(tm) 64 Processor 3200+ / ASUS A8NE-FM / 1GB RAM
Ubuntu Karmic 32 bit with the latest updates.

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Slow USB transfer for FAT32
https://bugs.launchpad.net/bugs/392089
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