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rootfs procedure sda, sda1 and sda5

  • During procedure for carry out rootfs specifically step for inserting USB stick the following shows up on the serial termina:

    root@Omega-xxxx:/dev# [  906.330000] usb 1-1: new high-speed USB device number 2 using ehci-platform
    [  906.480000] usb-storage 1-1:1.0: USB Mass Storage device detected
    [  906.500000] scsi host0: usb-storage 1-1:1.0
    [  907.500000] scsi 0:0:0:0: Direct-Access     HP       v100w            1.00 PQ: 0 ANSI: 2
    [  907.510000] sd 0:0:0:0: [sda] 3913664 512-byte logical blocks: (2.00 GB/1.86 GiB)
    [  907.510000] sd 0:0:0:0: [sda] Write Protect is off
    [  907.520000] sd 0:0:0:0: [sda] Mode Sense: 32 07 03 f0
    [  907.520000] sd 0:0:0:0: [sda] No Caching mode page found
    [  907.530000] sd 0:0:0:0: [sda] Assuming drive cache: write through
    [  907.540000]  sda: sda1 < sda5 >
    [  907.550000] sd 0:0:0:0: [sda] Attached SCSI removable disk
    What I would like to draw your attention to is the line showing "sda: sda1<sda5> and when listing the dir of /dev the same items:
    root@Omega-xxxx:/dev# ls /dev
    bus                 mtd1ro              mtdblock3           sda1
    console             mtd2                mtdblock4           sda5
    cpu_dma_latency     mtd2ro              mtdblock5           shm
    full                mtd3                network_latency     snd
    i2c-0               mtd3ro              network_throughput  tty
    kmsg                mtd4                null                ttyATH0
    log                 mtd4ro              port                ttyS0
    mem                 mtd5                ppp                 urandom
    memory_bandwidth    mtd5ro              ptmx                watchdog
    mtd0                mtdblock0           pts                 zero
    mtd0ro              mtdblock1           random
    mtd1                mtdblock2           sda

    In this directory appears to be three sda, sda1 and sda5. Why is sd5 showing up and how does this affect the mount procedure?

  • Hi @Guest, the reason that three devices show up is because your drive is partitioned into 2 partitions. sda is the physical drive, sda1 and sda5 are two partitions within sda. When you are setting up the mounting procedure, you can choose to mount both sda1 or sda5 or one of them.

  • Does agree with our description of the partitions? Ran fdisk -l and got:

    Device Boot Start End Blocks Id System
    /dev/sda1 1 1944 1950751+ f Win95 Ext'd (LBA)
    /dev/sda5 2 1944 1950720 83 Linux

    As you can see the sda5 does show up?
    Also why is the win95 portion showing up? Reformatted using Minitool Partition on Windows machine.
    Don't have a unix box setup.
    And attempting to use mkfs.ext x /dev/sdax fails to work

  • FYI If you use Minitool Partition for Windows it will, when you format the USB stick to type ext4, create sda1 as Win95 Ext'd partition.

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