Thomas Nikolajsen <[email protected]> added the comment: It seems like you don't have a recognized MBR on 'ad0'. Installing an initial MBR can be done by: fdisk -BI ad0
Updating the MBR can be done by: fdisk -u ad0 If you would like to have multiple OSs installed, a boot manager can be installed in MBR by: disklabel -B ad0 How did you try to modify MBR; using installer or manually? If manually; which commands did you use? (e.g. dd if=/dev/zero of=/dev/ad0 bs=512 count=32 fdisk -BI ad0 dd if=/dev/zero of=/dev/ad0s1 bs=512 count=32 disklabel -w -B ad0s1 auto disklabel -e ad0s1 as example in disklabel man page) Are you sure the HD you would like to modify is 'ad0'? 'da0' is first AHCI / SCSI attached disk, 'da8' is first external disk (e.g. USB attached), 'ad0' is first ATA / SATA, non-AHCI attached disk. Your logs show several disks, ad0, ad8 & da0, in system: egrep '(ad|da)[[:digit:]]' DMESG .. ad0: 238475MB <SAMSUNG HM251JJ 2AA00 00> at ata0-master UDMA33 ad0: 488397168 sectors [484521C/16H/63S] 16 sectors/interrupt 1 depth queue ad0: invalid primary partition table: no magic da0 at ahci0 bus 0 target 0 lun 0 da0: <SATA HITACHI HTS72201 DCDZ> Fixed Direct Access SCSI-4 device da0: Serial Number 071103DP1D10DGG5YHJP da0: 150.000MB/s transfers da0: 152627MB (312581808 512 byte sectors: 255H 63S/T 19457C) da0: type 0x27, start 2048, end = 13860863, size 13858816 : OK da0: type 0x7, start 13865040, end = 312575759, size 298710720 : OK da8 at umass-sim1 bus 1 target 0 lun 0 da8: <3System USB FlashDisk 1.00> Removable Direct Access SCSI-2 device da8: 1.000MB/s transfers da8: 15360MB (31457280 512 byte sectors: 255H 63S/T 1958C) da8: type 0xc, start 63, end = 31455647, size 31455585 : OK (da8:umass-sim1:1:0:0): lost device (da8:umass-sim1:1:0:0): removing device entry da8 at umass-sim0 bus 0 target 0 lun 0 da8: <3System USB FlashDisk 1.00> Removable Direct Access SCSI-2 device da8: 40.000MB/s transfers da8: 15360MB (31457280 512 byte sectors: 255H 63S/T 1958C) da8: type 0xc, start 63, end = 31455647, size 31455585 : OK ---------- status: unread -> chatting _____________________________________________________ DragonFly issue tracker <[email protected]> <http://bugs.dragonflybsd.org/issue1560> _____________________________________________________
