[BBC-Micro] Harddisc fakery using a microcontroller
kortink at inter.nl.net
Tue Dec 14 22:32:13 GMT 2010
On Tue, 14 Dec 2010 21:05:13 +0000, Wookie <bbcmicro at wooky.plus.com>
>On 29/11/10 15:29, John Kortink wrote:
>> Don't ditch hard drives that seem to have died just because of
>> a powering error (e.g. 12V on the 5V line).
>> Many drives are protected against this with a 'transil', which
>> very quickly shorts the power line to ground if it exceeds the
>> expected voltage. Unfortunately, this is a permanent condition.
>> But when the transil is removed, the drive will most likely be
>> fine. Replacing the transil is sort-of optional, since the drive
>> itself will function fine without it.
>> John Kortink
>What do these "transil's" look like ?
Like this :
(see technical datasheet for a more telling picture)
>and are they on the data lines as well ?
I don't think so. It would be hard to get excessive
voltages on anything but the power lines.
>Ages ago was using a 3.5" to 2.5" cable to connect a laptop IDE drive to
>a desktop machine and like a idiot I plugged the cable into the laptop
>drive upside down and sent the power into the data pins, bingo one dead
That's very similar to what I did ... %-(
Email : kortink at inter.nl.net
Homepage : http://www.inter.nl.net/users/J.Kortink
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