On Sat, Feb 16, 2013 at 10:07:55AM +0100, Ronald wrote: > > 3) The device should appear as /dev/sdb according to the logs > > It did, once. There were no partitions. Manual does not mention an > initial format and I don't want to brick it. It did come up with > another device /dev/sdc. The size really roughly corresponds to what > the manual mentions. However, it contains four (bogus?) partitions, > one of them mentioning Novell Netware or something like that. Please > note, this is with a v3.4 kernel. Looks like behaviour varies across > kernel versions. Don't think this counts as a regression though... > > Disk /dev/sdc: 3426 MB, 3426746368 bytes > 106 heads, 62 sectors/track, 1018 cylinders, total 6692864 sectors > Units = sectors of 1 * 512 = 512 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disk identifier: 0x6f20736b > > This doesn't look like a partition table > Probably you selected the wrong device. > > Device Boot Start End Blocks Id System > /dev/sdc1 ? 778135908 1919645538 570754815+ 72 Unknown > /dev/sdc2 ? 168689522 2104717761 968014120 65 Novell Netware 386 > /dev/sdc3 ? 1869881465 3805909656 968014096 79 Unknown > /dev/sdc4 ? 0 3637226495 1818613248 d Unknown > > Mounting them does not work, the /dev/sdc* nodes are never created: > > mount: special device /dev/sdc1 does not exist > mount: special device /dev/sdc2 does not exist > mount: special device /dev/sdc3 does not exist > mount: special device /dev/sdc4 does not exist Did you also try to mount the /dev/sdc device directly? It might be an unpartitioned device with a FAT filesystem (Android phones which support USB storage mode look like this from the USB host side). The first sector of such filesystems in most cases contains the bootloader code at the place where the MS-DOS partition table would be located in an MBR, therefore fdisk shows bogus partitions when used with such devices. However, the Linux kernel is usually smart enough to notice that the data does not look like a proper partition table and avoid registering the partitions. > Furthermore: > > mount: /dev/sg0 is not a block device > mount: /dev/sg1 is not a block device > mount: /dev/sg2 is not a block device > mount: /dev/sg3 is not a block device Mounting /dev/sg* will never work - these are character devices used by programs which send SCSI commands directly.
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