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In my programe, I need mount hotplug device,for example,U Disk, SD card. In the case of don't know the device can write, I use like "mount -w" command to mount ...
  1. 10-08-2011 #1
    ice2000feng
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    In the case of don't know the device can write, how to mount device

    In my programe, I need mount hotplug device,for example,U Disk, SD card.
    In the case of don't know the device can write, I use like "mount -w" command to mount the device, the mount will be failed,
    error message:block device /dev/sda1 is write-protected but explicit `-w' flag given.

    I don't know how to know whether the device is readalbe or writable before I mount the device.
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  2. 10-10-2011 #2
    Rubberman
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    Usually, mounting the device without options will figure out if it is readable/writable or whatever and do the right thing. Example, assuming that an sd card is registered as /dev/sdn and it has a partition as /dev/sdn1, and the sd card has its write-protect switch enabled, then then command "mount /dev/sdn1 mountpoint" should 1) detect what file system it uses (probably fat or fat32), 2) determine that it is read-only, and 3) mount it on the mountpoint as a read-only file system that you can read from, but not write to.
    Sometimes, real fast is almost as good as real time.
    Just remember, Semper Gumbi - always be flexible!
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