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It is a very strange problem. My usb harddisk has four partitions, one is primary, the other three are logical (contained within an extended partition). When I plug in the disk, three of the partitions are mounted automatically except one--the first logical partition in the extended partition.

Initially I thought it is the problem of system (at that time I used Mint). But after I change to Ubuntu 12.04, the problem wasn't solved. I don't want to add a rule in fstab, and I want to know what happened. The disk is fine, and the partition can be accessed in Windows and mounted manually.

result of dmesg | tail:

[100933.557649] usb 2-1.2: new high-speed USB device number 4 using ehci_hcd
[100933.651891] scsi8 : usb-storage 2-1.2:1.0
[100934.649047] scsi 8:0:0:0: Direct-Access     SAMSUNG                        PQ: 0 ANSI: 0
[100934.650963] sd 8:0:0:0: Attached scsi generic sg2 type 0
[100934.651342] sd 8:0:0:0: [sdb] 625142448 512-byte logical blocks: (320 GB/298 GiB)
[100934.651977] sd 8:0:0:0: [sdb] Write Protect is off
[100934.651989] sd 8:0:0:0: [sdb] Mode Sense: 03 00 00 00
[100934.652836] sd 8:0:0:0: [sdb] No Caching mode page present
[100934.652848] sd 8:0:0:0: [sdb] Assuming drive cache: write through
[100934.655354] sd 8:0:0:0: [sdb] No Caching mode page present
[100934.655367] sd 8:0:0:0: [sdb] Assuming drive cache: write through
[100934.734652]  sdb: sdb1 sdb3 < sdb5 sdb6 sdb7 >
[100934.737706] sd 8:0:0:0: [sdb] No Caching mode page present
[100934.737725] sd 8:0:0:0: [sdb] Assuming drive cache: write through
[100934.737731] sd 8:0:0:0: [sdb] Attached SCSI disk

result of parted -l:

Model: SAMSUNG  (scsi)
Disk /dev/sdb: 320GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type      File system  Flags
 1      32.3kB  21.5GB  21.5GB  primary   ntfs
 3      21.5GB  320GB   299GB   extended               lba
 5      21.5GB  129GB   107GB   logical   ntfs
 6      129GB   236GB   107GB   logical   ntfs
 7      236GB   320GB   83.8GB  logical   ntfs
share|improve this question
Please do the following to provide important diagnostic information. (1) Plug the USB hard drive into your computer. (2) Wait about 10 seconds. (3) In a Terminal window (Ctrl+Alt+T), run dmesg | tail. Then run sudo parted -l. (That's a lower-case L, not an upper-case i.) If asked for your password enter it (it's fine that you won't see any change while doing so--just type it in and press enter). (4) Select all the text in the Terminal window, copy it to the clipboard, and then provide it here by editing your question, pasting it in, and using the <$> tool. – Eliah Kagan Jun 12 '12 at 19:36

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