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On Friday 09 October 2009, Stroller wrote: |
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> On 8 Oct 2009, at 22:10, Paul Hartman wrote: |
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> > ... |
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> > With SD cards, often times there are no partitions. So if you create |
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> > proper partitions sometimes it won't read in other devices/computers. |
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> > (in linux terms that means you would format /dev/sda not /dev/sda1) |
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> |
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> Uh, unless SD cards are seriously goofy - a possibility I concede - |
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> then they're just a bunch of blocks. Partitions are just something you |
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> - either you the user, or the manufacturer if they come pre-formatted |
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> - put on there. |
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> |
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> I'm pretty sure that my experience with at least one external hard- |
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> drive (USB mass-storage device) was that formatting /dev/sda worked |
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> just fine under Linux (and, I think OS X) but was not recognised by |
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> Windows XP. IIRC mkfs.vfat gave a warning. When formatted by Windows |
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> XP and remounted in Linux the drive was of the /dev/sda1 type of |
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> partition layout. |
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> |
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> This seems to be the opposite of how you describe, unless I am |
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> misreading. |
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|
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Some USB sticks are formatted as floppy disks (?) and show up as /dev/sda |
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(instead of /dev/sda1). I have had no problems mounting these in Linux or |
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MSWindows, but wouldn't know how to format them in Linux. Their partitions |
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look all over the shop. dmesg shows: |
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====================================== |
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usb-storage: device scan complete |
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sd 1:0:0:0: [sda] 1997312 512-byte hardware sectors: (1.02 GB/975 MiB) |
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sd 1:0:0:0: [sda] Write Protect is off |
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sd 1:0:0:0: [sda] Mode Sense: 03 00 00 00 |
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sd 1:0:0:0: [sda] Assuming drive cache: write through |
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sd 1:0:0:0: [sda] Assuming drive cache: write through |
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sda: |
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sd 1:0:0:0: [sda] Attached SCSI removable disk |
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====================================== |
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|
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and fdisk: |
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====================================== |
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# fdisk -l /dev/sda |
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|
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Disk /dev/sda: 1022 MB, 1022623744 bytes |
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32 heads, 61 sectors/track, 1023 cylinders |
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Units = cylinders of 1952 * 512 = 999424 bytes |
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Disk identifier: 0x69737369 |
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|
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This doesn't look like a partition table |
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Probably you selected the wrong device. |
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|
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Device Boot Start End Blocks Id System |
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/dev/sda1 ? 957875 1044294 84344761 69 Unknown |
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Partition 1 has different physical/logical beginnings (non-Linux?): |
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phys=(68, 13, 10) logical=(957874, 21, 37) |
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Partition 1 has different physical/logical endings: |
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phys=(288, 115, 43) logical=(1044293, 15, 36) |
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Partition 1 does not end on cylinder boundary. |
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/dev/sda2 ? 871681 1829612 934940732+ 73 Unknown |
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Partition 2 has different physical/logical beginnings (non-Linux?): |
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phys=(371, 114, 37) logical=(871680, 1, 61) |
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Partition 2 has different physical/logical endings: |
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phys=(366, 32, 33) logical=(1829611, 4, 30) |
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Partition 2 does not end on cylinder boundary. |
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/dev/sda3 ? 2 2 0 74 Unknown |
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Partition 3 has different physical/logical beginnings (non-Linux?): |
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phys=(371, 114, 37) logical=(1, 10, 12) |
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Partition 3 has different physical/logical endings: |
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phys=(372, 97, 50) logical=(1, 10, 11) |
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Partition 3 does not end on cylinder boundary. |
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/dev/sda4 1 1759792 1717556736 0 Empty |
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Partition 4 has different physical/logical beginnings (non-Linux?): |
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phys=(0, 0, 0) logical=(0, 0, 1) |
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Partition 4 has different physical/logical endings: |
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phys=(0, 0, 0) logical=(1759791, 23, 37) |
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Partition 4 does not end on cylinder boundary. |
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|
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Partition table entries are not in disk order |
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====================================== |
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|
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While parted again has no problem seeing it and identifying the partition |
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tablet as "loop" instead of MSDOS: |
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====================================== |
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# parted /dev/sda |
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Warning: GNU Parted has detected libreiserfs interface version mismatch. |
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Found 1-1, required 0. ReiserFS support will be disabled. |
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GNU Parted 1.8.8 |
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Using /dev/sda |
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Welcome to GNU Parted! Type 'help' to view a list of commands. |
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(parted) p |
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Model: Crucial Gizmo! overdrive (scsi) |
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Disk /dev/sda: 1023MB |
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Sector size (logical/physical): 512B/512B |
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Partition Table: loop |
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|
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Number Start End Size File system Flags |
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1 0.00B 1023MB 1023MB fat16 |
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====================================== |
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-- |
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Regards, |
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Mick |
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