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I am running Neutrino 6.4.0 with an attached standard 2.5" , 250GB Toshiba hard disk with 6 pre-existing qnx6 partitions. All of them can be mounted read-only; however, I cannot mount any of those as read/write. For instance:

mount -r -t qnx6 /dev/hd1t77.3 /home/p3

works fine, while 

mount -t qnx6 /dev/hd1t77.3 /home/p3

returns the following:

mount: Can't mount /home/p3 (type qnx6)
mount: Possible reason: Read-only file system

I have even tried different sync options (-o sync=ignore , and -o sync=optional), to no avail.

Interestingly, I have created an additional partition on the same disk using mkqnx6fs /dev/hd1t77.6 , and that partition CAN be mounted read/write

My question is, what might be causing the existing partitions to be read-only, and is there any way to make them read-write?

gcaglion
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    Relevant to this: `mount -o sync=optional /dev/usb0 /home/hdd` worked for me (I know you said it didn't work for you) – Maghoumi Feb 24 '18 at 00:12

1 Answers1

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Your system defines partitions as qnx4 (t77). Probably you should try mount it with qnx4 type. See official help for details.

Dmitry Tabakov
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  • Thanks for your answer. However, I am sure the partitions are qnx6, and in any case trying to mount them as qnx4 fails with `Corrupted file system detected`. Bear in mind that mounting these partitions as qnx6, readonly results in them being perfectly readable – gcaglion Aug 24 '16 at 15:19
  • Some ideas: 1. try '-w' flag for mount, 2. mount as read and remount with flags '-wu' – Dmitry Tabakov Aug 24 '16 at 17:16
  • Thanks again, but I had already tried both, with the same outcome. One angle I'm working now is trying to figure out what is different between the existing partitions, and the one I created with `mkqnx6fs` , given that the latter can be mounted as rw. However, I quickly found that fdisk gives me totally meaningless results; for instance, instead of showing the 6 partitions I have (and can mount) on the disk, it only shows 2 partitions: one marked 'non-QNX' type 114 , the other marked 'DOS' type 6. Now I'm lost! – gcaglion Aug 25 '16 at 08:04