Date: Sun, 21 Dec 2003 12:59:09 -0600 (CST) From: Chris Dillon <cdillon@wolves.k12.mo.us> To: Mathias Haas <mathias@haas.se> Cc: freebsd-firewire@freebsd.org Subject: Re: Hotplug? Message-ID: <20031221123041.R47428@duey.wolves.k12.mo.us> In-Reply-To: <3FE21E61.3080303@haas.se> References: <27378.193.14.163.194.1071750767.squirrel@mail.haas.se> <20031218212616.GD51181@wiz.com> <3FE21E61.3080303@haas.se>
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On Thu, 18 Dec 2003, Mathias Haas wrote: > In Linux (2.4.x kernel) and Windows it's possible to simply > disconnect the drive and put it in a bag. I don't know about Linux, but in Windows it is not OK to simply unplug most removable hardware. In Windows 2000 and later, you must use the "Safely Remove Hardware" icon on your taskbar before removing any USB, Firewire, PCMCIA, Hot-Plug PCI, and possibly some other types of removable hardware. If you don't use this feature, you will probably get away with it most of the time, but you run the risk of damaging hardware, corrupting a filesystem, losing data, or crashing the OS. Windows tries to reduce the potential for lost data and/or corrupted filesystems by either turning off the write-cache for removable storage entirely, or keeping the write delay very short. > I wanted to know if this is possible in FreeBSD as well. No more than it is in Windows and Linux. There are ways to lower the chances of a failure on sudden removal of a device, but you can't guarantee it 100% without the user first telling the OS that the device is about to go away. Remember, its called "Hot-Plug", not "Hot-Unplug". :-) -- Chris Dillon - cdillon(at)wolves.k12.mo.us FreeBSD: The fastest, most open, and most stable OS on the planet - Available for IA32, IA64, PC98, Alpha, and UltraSPARC architectures - x86-64, PowerPC, ARM, MIPS, and S/390 under development - http://www.freebsd.org Q: Because it reverses the logical flow of conversation. A: Why is putting a reply at the top of the message frowned upon?
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