From owner-freebsd-questions Thu Feb 23 01:34:13 1995 Return-Path: questions-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.9/8.6.6) id BAA26697 for questions-outgoing; Thu, 23 Feb 1995 01:34:13 -0800 Received: from brian.jpl.nasa.gov (brian.jpl.nasa.gov [128.149.53.45]) by freefall.cdrom.com (8.6.9/8.6.6) with ESMTP id BAA26691 for ; Thu, 23 Feb 1995 01:34:10 -0800 Received: (from lim@localhost) by brian.jpl.nasa.gov (8.6.8/8.6.6) id BAA10512; Thu, 23 Feb 1995 01:33:38 -0800 Date: Thu, 23 Feb 1995 01:33:38 -0800 From: David Lim Message-Id: <199502230933.BAA10512@brian.jpl.nasa.gov> To: krnlhkr@mcs.com, questions@FreeBSD.org CC: lim@brian.jpl.nasa.gov In-reply-to: (krnlhkr@mcs.com) Subject: Re: [Q] FreeBSD 2.0R - fdisk is non-destructive? Reply-to: lim@robotics.jpl.nasa.gov Sender: questions-owner@FreeBSD.org Precedence: bulk From: krnlhkr@mcs.com Date: Tue, 21 Feb 95 00:35 CST X-Mailer: AIR Mail 3.X (SPRY, Inc.) <---- Begin Included Message ----> I just installed FreeBSD 2.0-R from the Walnut CD-ROM on a 1 Gbyte drive. I created two slices one for DOS and one for FreeBSD. When I boot DOS, I run fdisk, and it shows the slice sizes correctly. However, the DOS dir command still reports free space relative to the entire disk. E.g. it says 100 Mbytes used, 900 Mbytes free. Is this just a DOS bug of some sort? I'm worried that DOS will overwrite sectors assigned to FreeBSD. <---- End Included Message ----> An additional piece of information. When I first partitioned the FreeBSD slice, I first imported the MS-DOS slice to partition e. However, when I do a df under FreeBSD, it shows the same incorrect information as the DOS DIR command. df shows my /dev/sd0e (MS-DOS slice) as having a capacity the size of the entire disk! This may seem stupid, but are you running Stacker or something like it? No I'm not running Stacker. If not, check to see if the BIOS says you have more than 1024 cylinders. If it does, you may have to upgrade your BIOS or run a TSR that comes with the drive. DOS can't see more than 1024 cylinders, and may get confused. I include the output from DOS fdisk, dmesg, /sbin/fdisk, and /sbin/disklabel below. DOS says I have less than 1024 cylinders, although the dmesg shows the disk reporting a real geometry of 2756 cyl. I did use the geometry reported by DOS in the FreeBSD install. You can see this in the data from disklabel and /sbin/fdisk. One way around this is to put DOS completely in the first 1024 cylinders. This way if ncyl % 1024 is stored in the partition table, it will be correct for DOS. I believe I have DOS in the first 1024 cylinders. That's my best guess without knowing exactly what you have. My hardware is as follows: Micron brand machine Pentium 90 MHz Neptune chipset Buslogic BT946C PCI SCSI card Conner 1Gbyte drive (you can see its geometry in the messages below) Plextor 4X CD-ROM Diamond Stealth 2Mbyte VRAM -Louis ---------------------------------------------------------------------- Louis J. Giliberto, Jr. ! Support the Free Software Foundation krnlhkr@mcs.com ! ---------------------------------------------------------------------- I've looked through the FAQ and searched through the mailing list archives. The only thing I've come up with is the SCSI card setting for 1 Gbyte drives. I have this turned ON on the Buslogic card. Perhaps I should turn it off? I tried turning it off, and tried booting (no reinstall) both DOS and FreeBSD, they both still had the same problem, showing the MSDOS partition occupying the entire drive. Perhaps I should turn it off and reinstall all of FreeBSD and Windows/DOS? Perhaps I should use the real geometry of the drive, and just make sure that the partition of DOS resides within 1024 cylinders again using the real geometry of the drive? This just doesn't sound quite right to me. So I guess fdisk is destructive? Everyone who has partitioned their disk to install FreeBSD, had to re-install DOS and windows? I seem to recall a message someplace saying that some Conner drives have some sort of auto-translation of the cylinders? And that some special care needs to be taken when writing the MBR code? Unfortunately I can't seem to track down this message. --------------------------------------------------------------------------- --- Output of DOS fdisk Partition Status Type Volume Label Mbytes System Usage C: 1 A PRI-DOS Micron 501 FAT16 49% 2 non-DOS 512 51% --------------------------------------------------------------------------- --- Output of tools\dos-tools\pfdisk 0 geometry 1013 64 32 (cyl hd sec) # ID First (cyl) Last (cyl) Nmae #start, length 1 6 0 500 Dosbi 32,1026016 2 165 501 1012 unkno 1026048,1048576 --------------------------------------------------------------------------- --- Output of dmesg FreeBSD 2.0-RELEASE #2: Tue Nov 22 13:59:59 1994 root@fnord.cdrom.com:/usr/src/sys/compile/GENERIC CPU: Pentium (Pentium-class CPU) 89 MHz Id = 0x524 Origin = "GenuineIntel" real memory = 16384000 (4000 pages) avail memory = 14929920 (3645 pages) using 290 buffers containing 2379776 bytes of memory Probing for devices on the ISA bus: sc0 at 0x60-0x6f irq 1 on motherboard sc0: VGA color <4 virtual consoles> ed0 not found at 0x280 ed1 not found at 0x300 sio0 at 0x3f8-0x3ff irq 4 on isa sio0: type 16550A sio1 at 0x2f8-0x2ff irq 3 on isa sio1: type 16550A sio2 not found at 0x3e8 sio3 not found at 0x2e8 lpt0 at 0x378-0x37f irq 7 on isa lpt0: Interrupt-driven port lp0: TCP/IP capable interface lpt1 not found at 0xffffffff lpt2 not found at 0xffffffff fdc0 at 0x3f0-0x3f7 irq 6 drq 2 on isa fdc0: [0: fd0: 1.44MB 3.5in] wdc0 not found at 0x1f0 wdc1 not found at 0x170 bt0: Bt946C/ 0-PCI/EISA/VLB(32bit) bus bt0: reading board settings, busmastering, int=15 bt0: version 4.24, sync, parity, 32 mbxs, 32 ccbs bt0: targ 0 sync rate=10.00MB/s(100ns), offset=15 bt0: targ 6 sync rate= 4.54MB/s(220ns), offset=15 bt0: Enabling Round robin scheme bt0 at 0x330 irq 15 on isa bt0 waiting for scsi devices to settle bt0 targ 0 lun 0: type 0(direct) fixed SCSI2 bt0 targ 0 lun 0: sd0: 1013MB (2074880 total sec), 2756 cyl, 8 head, 94 sec, bytes/sec 512 bt0 targ 6 lun 0: type 5(readonly) removable SCSI2 bt0 targ 6 lun 0: cd0: cd present.[145069 x 2048 byte records] uha0 not probed due to I/O address conflict with bt0 at 0x330 ahc0 not found ahb0 not found aha0 not probed due to I/O address conflict with bt0 at 0x330 aic0 not found at 0x340 pas0 not found at 0x1f88 sea0 not found wt0 not found at 0x300 mcd0: timeout getting status mcd0 not found at 0x300 mcd1: timeout getting status mcd1 not found at 0x340 ie0 not found at 0x360 ep0 not found at 0x300 is0 not found at 0x280 le0: no board found at 0x300 le0 not found at 0x300 ze0 not found at 0x300 npx0 on motherboard pci0: scanning device 0..15, mechanism=2. chip0 on pci0:0 chip1 on pci0:2 pci0:3: vendor=0x1095, device=0x640, class=storage [not supported] map(10): io(1f0) map(14): io(3f4) map(18): io(170) map(1c): io(374) pci0:13: vendor=0x104b, device=0x1040, class=storage [not supported] map(10): io(fcfc) graphics0 on pci0:14 changing root device to sd0a --------------------------------------------------------------------------- --- Output of /sbin/disklabel # /dev/rsd0a: type: SCSI disk: label: MBR based label flags: bytes/sector: 512 sectors/track: 32 tracks/cylinder: 64 sectors/cylinder: 2048 cylinders: 1013 rpm: 0 interleave: 0 trackskew: 0 cylinderskew: 0 headswitch: 0 # milliseconds track-to-track seek: 0 # milliseconds drivedata: 0 8 partitions: # size offset fstype [fsize bsize cpg] a: 51200 1026048 4.2BSD 1024 8192 16 # (Cyl. 501 - 525) b: 65536 1077248 swap # (Cyl. 526 - 557) c: 1048576 1026048 unused 0 0 # (Cyl. 501 - 1012) d: 2074880 0 unused 0 0 # (Cyl. 0 - 1013*) e: 1026016 32 MSDOS # (Cyl. 0*- 500*) g: 931840 1142784 4.2BSD 1024 8192 16 # (Cyl. 558 - 1012) Warning, revolutions/minute 0 super block size 0 --------------------------------------------------------------------------- --- Output of /sbin/fdisk ******* Working on device /dev/rsd0a ******* parameters extracted from in-core disklabel are: cylinders=1013 heads=64 sectors/track=32 (2048 blks/cyl) parameters to be used for BIOS calculations are: cylinders=1013 heads=64 sectors/track=32 (2048 blks/cyl) Warning: BIOS sector numbering starts with sector 1 Information from DOS bootblock is: The data for partition 0 is: sysid 6,(Primary 'big' DOS (> 32MB)) start 32, size 1026016 (500 Meg), flag 80 beg: cyl 0/ sector 1/ head 1; end: cyl 500/ sector 32/ head 63 The data for partition 1 is: sysid 165,(386BSD) start 1026048, size 1048576 (512 Meg), flag 0 beg: cyl 501/ sector 1/ head 0; end: cyl 1012/ sector 32/ head 63 The data for partition 2 is: The data for partition 3 is: