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Asked: 2026-05-27T13:06:42+00:00

I am using this method to access drive and reading sector. int fd =

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I am using this method to access drive and reading sector.

int fd = open("/dev/rdisk1s1");
nbytes_got = pread(fd, buf, nbytes, off);

but FD returns -1 means it failed. i need to read disks and their sectors but i am unable to do this in mac OS X. Please help me. Thanks in advance.

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1 Answer

  1. Editorial Team

    If open returns -1, then you need to check errno to see why it failed. The most likely reason is that you are not running your program as root or as a user in group operator.

    Also, you are missing the second (oflag) parameter to the open function.

    That is pretty basic knowledge. Reading disk sectors directly is generally a pretty advanced topic. You probably shouldn’t be doing this at your level of knowledge.

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