Date: Thu, 30 Aug 2012 22:05:55 +0300 From: =?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KLRg9GA0L7QstC10YY=?= <corebug@corebug.net> To: Warren Block <wblock@wonkity.com> Cc: FreeBSD Questions List <freebsd-questions@freebsd.org> Subject: Re: Force disk with old GPT label to be recognized as MBR one Message-ID: <CAKB6gVgUWbfnFTy4fkDwVgFShLsm0zvBx7DP7zsHNzwR3N5hEw@mail.gmail.com> In-Reply-To: <alpine.BSF.2.00.1208300721490.7149@wonkity.com> References: <CAKB6gVj_TLaqaKx1j=JZjVzFZnCWEJr%2BY-khjKBeN_C8zJyLXQ@mail.gmail.com> <alpine.BSF.2.00.1208300721490.7149@wonkity.com>
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2012/8/30 Warren Block <wblock@wonkity.com>: > On Thu, 30 Aug 2012, ??????? ??????? wrote: > >> Hello there, people! >> I have a FreeBSD box with 9.1-RC3 i386 and an interesting HDD. >> It was patitioned with GPT and zfs some (long) time ago. After that >> the hdd has been completely repartitioned with MBR scheme and one >> single freebsd (165) partition and one slice there. It worked fine in >> 7.2, but now i have to get the data from that slice and when i connect >> the hdd to 9.1 box, it finds old corrupt GPT label (i suppose, it's >> backup GPT header somewhere in the end of actual disk) and does not >> recognize the MBR scheme there. > > > In case it has not been said: make a full backup of everything on that disk > first using dd. > > Erasing the last 34 blocks or 17048 bytes of the disk will erase the backup > GPT. It may be enough to erase just the very last block. > > # diskinfo -v /dev/ada1 > /dev/ada1 > 512 # sectorsize > 256060514304 # mediasize in bytes (238G) > 500118192 # mediasize in sectors > > # : Not tested, could be off by one! > # dd if=/dev/zero of=/dev/ada1 bs=512 seek=500118191 > > Force a retaste with 'true > /dev/ada1', then see what gpart shows. If the > drive is still seen as GPT, adjust the seek to begin at (mediasize in > sectors) - 34. Thank you a lot! It worked like a charm! -- ~~~ WBR, Vitaliy Turovets Systems Administrator Corebug.Net +38(093)265-70-55 VITU-RIPE X-NCC-RegID: ua.tv
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