{
    "mode": "man",
    "parameter": "hd",
    "section": "4",
    "url": "https://www.chedong.com/phpMan.php/man/hd/4/json",
    "generated": "2026-10-08T12:29:58Z",
    "sections": {
        "NAME": {
            "content": "hd - MFM/IDE hard disk devices\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "The hd* devices are block devices to access MFM/IDE hard disk drives in raw mode.  The master\ndrive  on  the primary IDE controller (major device number 3) is hda; the slave drive is hdb.\nThe master drive of the second controller (major device number 22) is hdc and  the  slave  is\nhdd.\n\nGeneral  IDE  block device names have the form hdX, or hdXP, where X is a letter denoting the\nphysical drive, and P is a number denoting the partition on that physical drive.   The  first\nform,  hdX,  is used to address the whole drive.  Partition numbers are assigned in the order\nthe partitions are discovered, and only nonempty, nonextended partitions get a number.   How‐\never,  partition numbers 1–4 are given to the four partitions described in the MBR (the \"pri‐\nmary\" partitions), regardless of whether they are unused or extended.  Thus, the first  logi‐\ncal  partition  will  be hdX5.  Both DOS-type partitioning and BSD-disklabel partitioning are\nsupported.  You can have at most 63 partitions on an IDE disk.\n\nFor example, /dev/hda refers to all of the first IDE  drive  in  the  system;  and  /dev/hdb3\nrefers to the third DOS \"primary\" partition on the second one.\n\nThey are typically created by:\n\nmknod -m 660 /dev/hda b 3 0\nmknod -m 660 /dev/hda1 b 3 1\nmknod -m 660 /dev/hda2 b 3 2\n...\nmknod -m 660 /dev/hda8 b 3 8\nmknod -m 660 /dev/hdb b 3 64\nmknod -m 660 /dev/hdb1 b 3 65\nmknod -m 660 /dev/hdb2 b 3 66\n...\nmknod -m 660 /dev/hdb8 b 3 72\nchown root:disk /dev/hd*\n",
            "subsections": []
        },
        "FILES": {
            "content": "/dev/hd*\n",
            "subsections": []
        },
        "SEE ALSO": {
            "content": "chown(1), mknod(1), sd(4), mount(8)\n\nLinux man-pages 6.7                          2023-10-31                                        hd(4)",
            "subsections": []
        }
    },
    "summary": "hd - MFM/IDE hard disk devices",
    "flags": [],
    "examples": [],
    "see_also": [
        {
            "name": "chown",
            "section": "1",
            "url": "https://www.chedong.com/phpMan.php/man/chown/1/json"
        },
        {
            "name": "mknod",
            "section": "1",
            "url": "https://www.chedong.com/phpMan.php/man/mknod/1/json"
        },
        {
            "name": "sd",
            "section": "4",
            "url": "https://www.chedong.com/phpMan.php/man/sd/4/json"
        },
        {
            "name": "mount",
            "section": "8",
            "url": "https://www.chedong.com/phpMan.php/man/mount/8/json"
        }
    ]
}