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#1
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What's the best way to preserve a HDD by software stopping the power?
On Wed, 26 Sep 2018 10:28:30 +0200, "R.Wieser"
wrote: Mike, I put a switch in the +5V and +12V on mine. Takes a few clicks to take it offline so you can cut the power safely. And I hope you *never* forget to shut your computer down first, otherwise its very likely it gets corrupted (nonwithstanding the fact that the NTFS filesystem has already mechanisms in place to recover from it, and you won't even notice it most of the time) (some removable drive bays even offer a magnetic mechanism to lock the bay in place to fix exactly that kind of mind-lapse problems) As you feel confident enough about electronics to put a switch into those lines, maybe you should think of (or google for) a solution that will disallow you to power-off a drive thats already been powered on. One of those solutions could involve a (rather oldfashioned, but still applicable) use of a relais. What is a relais? Regards, Rudy Wieser |
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What's the best way to preserve a HDD by software stopping thepower?
On 10/16/2018 8:07 PM, Lucifer wrote:
On Wed, 26 Sep 2018 10:28:30 +0200, "R.Wieser" wrote: Mike, I put a switch in the +5V and +12V on mine. Takes a few clicks to take it offline so you can cut the power safely. And I hope you *never* forget to shut your computer down first, otherwise its very likely it gets corrupted (nonwithstanding the fact that the NTFS filesystem has already mechanisms in place to recover from it, and you won't even notice it most of the time) (some removable drive bays even offer a magnetic mechanism to lock the bay in place to fix exactly that kind of mind-lapse problems) As you feel confident enough about electronics to put a switch into those lines, maybe you should think of (or google for) a solution that will disallow you to power-off a drive thats already been powered on. One of those solutions could involve a (rather oldfashioned, but still applicable) use of a relais. What is a relais? Regards, Rudy Wieser think *relay* Rene |
#3
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What's the best way to preserve a HDD by software stopping the power?
Lucifer,
What is a relais? A relays is a pushbutton which uses an electromagnet instead of a finger. http://www.galco.com/comp/prod/relay.htm In the above image the "movable armature" will be pulled down when the "electromagnet or coil" gets powered, causing the "movable contact" to touch the "stationary contact", thereby closing the circuit and thus powering the "load" (a lamp, motor, radio, computer or whatever else you want). Now imagine the "load" is a lamp, and the "electromagnet or coil" wires are connected to the "load". Also imagine another pushbutton (of the normal push-by-finger type) over the "movable contact" and "stationary contact". The lamp will stay out up until you press the pushbutton. But that also powers the "electromagnet or coil", which causes the "movable contact" to connect with the "stationary contact", effectivily taking over the function of the pushbutton. The end effect is that as long as there is power the lamp wil stay lit. When you than remove the "power supply" the lamp will go dark (duh :-), but *stay* that way even if power is re-applied. Now replace the lamp with the harddisk the OP was talking about , and you would have a drive you could switch on any time you like, but not be able to switch off again (and possibly loose information or even corrupt the drives contents) unless you switch the computer itself off (or possibly have it reboot). Regards, Rudy Wieser P.s. Relays come with single "on" switch (like in the image), but also with "off" or with both, and with more than one of them. A relays for a diskdrive would need at least two "on" ones, as both the 12v and 5v need to be switched. |
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What's the best way to preserve a HDD by software stopping the power?
Rene,
What is a relais? think *relay* Whoops. Used the Dutch name and did not even notice it. :-( Thanks for the heads-up. But now I feel like an ass for having posted a noobs explanation in regard to it ... Regards, Rudy Wieser |
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What's the best way to preserve a HDD by software stopping the power?
Lucifer, others,
In the above image the "movable armature" [snip] I mistakingly posted a page link instead of just to the image (its about two screens down). Here is the image for quick reference: http://www.galco.com/images/moreinfo/relay_diagram.gif Regards, Rudy Wieser |
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What's the best way to preserve a HDD by software stopping the power?
R.Wieser wrote:
Rene, What is a relais? think *relay* Whoops. Used the Dutch name and did not even notice it. :-( I think the word 'relais' stems from French, at least the French use the same word. BTW, are you Dutch? Because of your (first and last) name, I assumed you were German. |
#7
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What's the best way to preserve a HDD by software stopping the power?
Frank,
BTW, are you Dutch? Yep. Born and raised. Because of your (first and last) name, I assumed you were German. My great-great-great (-great?) father moved from Germany to the Netherlands (probably looking for work). So yes, my last name is something german (never worked out what exactly though). As for my first name ? I have no idea where it came from. Though my parents *intended* to just call me "rudie". It was a city official which put the "rudy" name on the birth certificate. As changing it would have been a big hassle they just left it that way. Regards, Rudy Wieser |
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What's the best way to preserve a HDD by software stopping the power?
R.Wieser wrote:
Frank, BTW, are you Dutch? Yep. Born and raised. Because of your (first and last) name, I assumed you were German. My great-great-great (-great?) father moved from Germany to the Netherlands (probably looking for work). So yes, my last name is something german (never worked out what exactly though). As for my first name ? I have no idea where it came from. Though my parents *intended* to just call me "rudie". It was a city official which put the "rudy" name on the birth certificate. As changing it would have been a big hassle they just left it that way. Thanks for the info, Rudy. As they say "If you ain't Dutch, you ain't much!" :-) |
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