VOGONS


First post, by cj_reha

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So I think I just did a bad and may have just killed an old Conner 540MB hard drive.

So basically I bought it off of eBay and before putting it into my DOS build I wanted to try it to see if it worked and to see if there were any files on it, since the listing just described it as "tested and working" (it was like 10 bucks, super cheap so even if it didn't work i wouldn't have lost that much money). So I opened up my custom 98 build, disconnected the secondary hard drive and hooked it up. I turned the computer on and the hard drive started smoking. Quickly, I flipped the switch on the back of the PSU off and disconnected it quickly. A basic inspection reveals nothing, the board seems to be undamaged? I'm scared to try to turn it on again in fear of damaging it more, since it's quite an old hard drive 😵

I thought maybe the PSU had had a power surge or killed the molex connector, so I temporarily hooked up the second hard drive again and voila, it span up. So the molex is perfectly fine. If this helps, the PSU is a RaidMax RX-500S (500 watt ATX12v)

I'm really scared right now that I killed a sort of rare, vintage hard drive I was gonna use in my dos build 😢

Is it possible to fry old hardware with too much power? I thought that even mid 2000s PSUs had overload protections... 😕

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Reply 2 of 19, by cj_reha

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sprcorreia wrote:
For a second you got me worried... […]
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For a second you got me worried...

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Ha, good one

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Reply 3 of 19, by sprcorreia

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Ok, now regarding the hard drive.

It was probably some component failure in the HDD. Old stuff, It happens. Don't use it anymore unless you want to risk some fireworks.

Reply 4 of 19, by brostenen

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Two components close to the power connector looks out of place.
Or should they look like that?

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Reply 5 of 19, by sprcorreia

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brostenen wrote:

Two components close to the power connector looks out of place.
Or should they look like that?

Good catch. Comparing to this photo maybe the HDD was (badly) repaired?

conner-cfs540a-540mb-3.5-ide-hard-drive-22.18.jpg

Reply 6 of 19, by cj_reha

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sprcorreia wrote:
Good catch. Comparing to this photo maybe the HDD was (badly) repaired? […]
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brostenen wrote:

Two components close to the power connector looks out of place.
Or should they look like that?

Good catch. Comparing to this photo maybe the HDD was (badly) repaired?

conner-cfs540a-540mb-3.5-ide-hard-drive-22.18.jpg

That's a very real possibility.

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Reply 7 of 19, by Jo22

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I don't know anything about this HDD, but generally speaking, some newer models do have protective circuits.
Again, I don't know anything about this model. It was just a thought.

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Reply 9 of 19, by Anonymous Coward

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Once I was building a custom Y-cable power splitter, and I somehow managed to reverse the 5V and 12V lines (and grounds). That will definitely smoke a harddrive....at least the circuit board part of it.

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Reply 10 of 19, by cj_reha

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Anonymous Coward wrote:

Once I was building a custom Y-cable power splitter, and I somehow managed to reverse the 5V and 12V lines (and grounds). That will definitely smoke a harddrive....at least the circuit board part of it.

It's not the molex, since it spins up the hard drive in the 98 machine perfectly fine. maybe different arrangement?

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Reply 11 of 19, by kaputnik

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The drive can't fry because you connected it to a PSU being capable of delivering a high amperage alone. As long as the power source delivers the correct voltage(s) and the drive's rated amperage or higher (which it probably does since your other drive works fine with the same PSU), there must be some problem with the drive itself for that to happen. If the drive works as supposed, it'll just take whatever power it needs and leave the rest so to speak.

From the pic, it looks like the smaller of the two dislocated components brostenen caught might be from somewhere completely else on the board. I just can't see any place where it would go right there at the connector (edit: a look at the photo sprcorreia posted confirms it). MIght even be completely foreign. A short right at the Molex connector will lead all available power at the same, and might generate enough heat to melt solder closely and smoke.

If I were you, I'd resolder the larger dislocated component, thoroughly investigate where the smaller one might come from, and which way it's supposed to be connected if it's not a foreign object. When you figured that out, and resoldered it if not determined to be something foreign, I'd do a double check for eventual unwanted solder bridging around the Molex connector, and then try powering the drive with a spare PSU I didn't care much about. If it spins up and runs a while without problems, it's good for a test in a computer that you're willing to risk. There's always a chance a malfunctioning device takes other stuff with it.

It could of course have been caused by a bad component too, and then there's not much to do if you don't have considerable skills in faultfinding electronics. The smaller dislocated component looking completely out of place where it is makes me believe more in it causing a short though.

Reply 12 of 19, by stamasd

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Once I managed to insert the molex power connector upside down in a HDD... burned both the drive and the PSU. :p

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Reply 13 of 19, by konc

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Unless the drive was not really tested and was lying somewhere ending up completely stuck. (yes, this has happened more than once). Did you hear it spin at all? If yes, this is not the case.

Reply 14 of 19, by Jepael

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To me the "dislocated components" look like a factory mod to move the capacitor slightly to add room for a filter inductor on a Y1 version board.

The other picture is from Y5 version board which may be redesigned regarding this issue so the filter at supply connector is not needed.

I don't see what has smoked though. It could be one of the black tantalum caps as it looks a bit bubbly and tantalums do tend to blow up.

Reply 16 of 19, by Unknown_K

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Could just be a tantalum cap giving up the ghost. I would take the board off and look on the other side from something that got hot.

I smoked a Plextor SCSI CDROM drive over a decade ago because the molex power plug actually went in the wrong way, pissed me off.

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Reply 18 of 19, by devius

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Usually when tantalum caps fail, they blow up very audibly and spectacularly. If this was just a smell of burnt plastic/electronics and a puff of smoke it was most likely a resistor or an IC being pushed way beyond its limits, probably by a fault somewhere else.

Reply 19 of 19, by chinny22

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Good chance it happened bouncing around in shipping, bouncing around more then normal.
Was "tested" months ago and in that time has died.
It was just its time.

Could of been any number or combination of those things, If other drives are fine I would blame the drive more then yourself