Date: Sat, 25 Jun 2016 06:23:55 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: Dave <freebsd01@dgmm.net> Cc: freebsd-questions@freebsd.org Subject: Re: The other problem : AHCI unbootable Message-ID: <alpine.BSF.2.20.1606250619190.82634@wonkity.com> In-Reply-To: <1890864.LfRUyAIFKl@amd.asgard.uk> References: <VI1PR02MB0974EE59E723F9B6678BDAC1F62E0@VI1PR02MB0974.eurprd02.prod.outlook.com> <alpine.BSF.2.20.1606242007070.4592@wonkity.com> <VI1PR02MB09746A4466FDDCF1ACDD9DCCF62F0@VI1PR02MB0974.eurprd02.prod.outlook.com> <1890864.LfRUyAIFKl@amd.asgard.uk>
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On Sat, 25 Jun 2016, Dave wrote: > On Saturday 25 June 2016 04:56:39 Manish Jain wrote: >> While installing FreeBSD 10.3 amd64, I tried switching from IDE to AHCI >> in my BIOS's boot configuration. But when I do this, the installer >> installs the OS on the hard disk, and then the system is unbootable - >> the BIOS screen hangs with the message : boot record missing. >> >> Can anyone please tell me what might be the problem ? >> > Not sure exactly what you are saying your process is, but switching between AHCI and IDE without a full and clean install will cause you problems. Solution. Don't do it. This has not been a problem for me with FreeBSD. The drivers and operating system are resilient enough to detect which mode is available and just use it. AHCI is preferred, though, giving a roughly 5-15% speed improvement. > This advice applies at least to WinXP too. That tends to reboot while > the Windows logo is on screen no matter which way around you do it. ie > if you install in IDE mode it will reboot if change to AHCI mode. > Same happens if you install in AHCI mode and then try to boot in IDE > mode. I can't recall about XP, but later versions do have AHCI drivers available. If the machine is to be dual-booted, that will limit the modes available to what works with the most limited operating system. Using FreeBSD as a single operating system and running the others as VMs with VirtualBox is one way around this.
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