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The problem you are having is the adaptor you tried is the right voltage but not the correct ampage. You require a 12v dc adapter with a rating of at least 1-Amp. The switchable supply you purchased would be well under the required level, probably 400ma (milli-amp), in other words about half the needed amount. A cable modem power adapter would be sufficiant. If you have one, make sure it is the correct voltage and polarity, positive pole (+) usually the inner pin on the end of the connector. Hope this is of some help to you.
According to several sites, the power supply is 12V, positive tip. You can find this at Radio Shack or your favorite electronic surplus store. You should take the Maxtor with you so you are sure the power connector fits.
Alternatively, you can check with a Maxtor vendor for the part.
Many USB power supplies will have the right plug. I picked one up by buying a cheap USB hub, What you want to look for (most likely on the bottom of the power supply) is VOLTAGE Output: 5.0 VDC, POWER Output: 1.0 amp or (1000ma) and the center hole is the positive side. I have even seen some BluTooth earpiece charges that supply what you need.
The voltages are right because hard drives use 12volts for the motor drive and 5volts for the digital logic circuits.
The only thing I don't know is the correct voltages for the various pins, there is a possibility it may not suit the LaCie.
This maybe a standard configuration for external USB hard drives, you need to check with LaCie.
i own the exact same drive. i'm looking for a spare power supply, came across this website, and saw your problem. the power supply is 12 volts dc at 2 amps. the connector that gets plugged into the hard drive: center pin is power (positive) and outer "shield" is ground (negative). hope this helps.
Need some more information to help you. Does your drive even spin up? If not, are the extra 4 pins you are referring to similar to the standard power pins on the PATA drives? If so they are to be used with power supplies that do not have the SATA power connector. You can use EITHER the SATA power connector(15 pin) OR the other 4 pin power connector. NOT BOTH !!!
If the pins are not power connectors, then you are probably referring to jumper pins. Ensure that that all the jumper pins are open.
If the drive still does not spin up, the pin 11 on the SATA power cable is probably floating indicating a delayed spin up mode. In this mode, the drive will need the PHY initialization sequence from the system before spinning up. You can override this by grounding pin 11 of the 15 pin SATA power connector. Refer to the attached picture for clarification.
If you still have questions send me a comment.
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