Hi Alan, Alan Stern wrote: > Maybe the problem is that the computer sends data before the flash > drive is ready to accept it. You can try delaying the data transfer. > > Edit drivers/usb/storage/transport.c. In usb_stor_Bulk_transport(), > > No, that didn't help. But I guess I got somewhat further. That particular usb pendrive was working for some time on my main desktop computer. I had created an encrypted device (without partition table, directly onto /dev/sdx) and put an ext3 filesystem inside. I could write some amount of data (some months ago) and then the file system hung, but I didn't care much about. Some weeks later I tried to create a new file system, and that's where the writing problems began. Now I had that particular writing problems with this USB pendrive on five different computers, alle with the latest Ubuntu. An mkfs.ext2 /dev/sdx failed on all machines the very same way. But then, when I used the pendrive in a Windows machine, I could easily format and use it with Windows. So the pendrive definitely is not broken - at least not completely. Surprisingly, after formatting it with Windows with a fat filesystem, it worked on all those Ubuntu machines, now I can write the files (onto fat). And now, the mkfs.ext2 /dev/sdx works as well (what did not terminate formerly). And even the large file can now be copied onto the stick. My guess is that the internal controller of the USB pendrive is somehow incompatible with Linux, encryption or ext2 filesystem. It is known that flash memory cards and drives have internal controllers that continuosly replace memory segments with each other to have them worn down equally. To do so, some of these controllers are able to "understand" dos/fat filesystems and use them as part of their strategy. I assume that I ran that controller with an encrypted filesystem into some error mode. Or hit some memory segments that are broken (it's a 16GB drive), where reformatting with vfat remixed the page order of those segments. I am not sure whether this is a problem of the USB drive (or its controller) or the Linux machine. Best regards (and merry Christmas) Hadmut -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
