I'm having problems with thunderbolt adaptor for seagate 3tb external hdd. faults include drive disconnecting on its own etc
im having problems with a new thunderbolt adaptor bought for seagate ext drive 3tb.
It came with some software which i installed but the drive disconnects on its own etc.
There is a whole lot of bad going on there.
There are problems both drive errors and USB errors. I don't believe it.
I have a hunch the drive is starving for power.
USB devices are supposed to function all the way down to 4.25V. Not all do.
USB ports are supposed to be able to deliver 4.25V at the end of the cable at 500mA. Not all do.
USB 2.0 devices are not supposed to draw more than 100mA unless they negotiate for more. Some violate that.
USB 2.0 devices are never supposed to draw more than 500mA. Some violate that. Especially disk drives.
My guess is that your drive is drawing excess current and the voltage drop through the port and cable are dropping you below 4.25; or at least below the voltage that your drive goes "Tango Uniform"[1]. Does your drive have the option for external power? If so try it. Following up on wtx's comment; USB 3.0 is capable of delivering more power. Also, some drives have used a cable that violates just about every aspect of the USB specification: A "Y" cable that plugs into two host ports to provide more power to the guest. I despise this solution with every fiber of my electrical engineering existence; never-the-less, you might try one.
edit: [1] Teats Up.
Last edited by ewaller (2015-04-04 17:02:04)
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