Messages in this thread | | | Date | Mon, 16 May 2005 18:00:50 +0200 | From | Matthias Andree <> | Subject | [OT] drive behavior on power-off (was: Disk write cache) |
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On Mon, 16 May 2005, Richard B. Johnson wrote:
> Then I suggest you never use such a drive. Anything that does this, > will end up replacing a good track with garbage. Unless a disk drive > has a built-in power source such as super-capacitors or batteries, what > happens during a power-failure is that all electronics stops and > the discs start coasting. Eventually the heads will crash onto > the platter. Older discs had a magnetically released latch which would > send the heads to an inside landing zone. Nobody bothers anymore.
IBM/Hitachi hard disk drives still use a "load/unload ramp" that entirely moves the heads off the platters - I've known this since the DJNA, and it is still advertised in Deskstar 7K500 and Ultrastar 15K147 to name just two examples.
-- Matthias Andree - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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