Date: Thu, 22 Feb 2007 22:04:15 -0800 From: "j w" <jwdevel@gmail.com> To: freebsd-fs@freebsd.org Subject: strange fdisk numbers Message-ID: <fa8771800702222204s25a681aaqe915368c77235243@mail.gmail.com>
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Hello (first post, so let me know if this is the wrong list for this) I am working up the courage to use growfs, but got a little confused by fdisk's numbers. The output is below, but what interests me is that it says "heads=16", but then later on has some partitions(slices) saying "head 254" and such there's 16 tracks/cylinder, so maybe that figures in the calculation somehow? (16 tracks * 16 heads ?) I put the output of bsdlabel -A as well any ideas? ******* Working on device /dev/ad2 ******* parameters extracted from in-core disklabel are: cylinders=26310 heads=16 sectors/track=63 (1008 blks/cyl) Figures below won't work with BIOS for partitions not in cyl 1 parameters to be used for BIOS calculations are: cylinders=26310 heads=16 sectors/track=63 (1008 blks/cyl) Media sector size is 512 Warning: BIOS sector numbering starts with sector 1 Information from DOS bootblock is: The data for partition 1 is: sysid 7 (0x07),(OS/2 HPFS, NTFS, QNX-2 (16 bit) or Advanced UNIX) start 63, size 10490382 (5122 Meg), flag 0 beg: cyl 0/ head 1/ sector 1; end: cyl 652/ head 254/ sector 63 The data for partition 2 is: sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD) start 14683410, size 11837070 (5779 Meg), flag 80 (active) beg: cyl 1023/ head 255/ sector 63; end: cyl 1023/ head 15/ sector 63 The data for partition 3 is: <UNUSED> The data for partition 4 is: <UNUSED> # /dev/ad2s2: type: unknown disk: amnesiac label: flags: bytes/sector: 512 sectors/track: 63 tracks/cylinder: 16 sectors/cylinder: 1008 cylinders: 11743 sectors/unit: 11837070 rpm: 3600 interleave: 1 trackskew: 0 cylinderskew: 0 headswitch: 0 # milliseconds track-to-track seek: 0 # milliseconds drivedata: 0 8 partitions: # size offset fstype [fsize bsize bps/cpg] a: 1048576 0 4.2BSD 2048 16384 8 b: 2045792 1048576 swap c: 11837070 0 unused 0 0 # "raw" part, don't edit d: 3119104 3094368 4.2BSD 2048 16384 28552 e: 1048576 6213472 4.2BSD 2048 16384 8 f: 4575022 7262048 4.2BSD 2048 16384 28552
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