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disc erase failed with error invalid request

HI,


I'm trying to get a new 2.5tb external wd hard drive to work with both my mac and my old pc - so i can backup my old data from the pc.


i have tried using disc utility, and erasing the disk and reformating to ms-dos (fat) format and recieve the following error message:


Disk erase failed with the following request: invalid request


i have also tried partitioning the hard drive, and recieve the same error message.


Any ideas on how to re-format this device?


Thanks!

MacBook Pro, Mac OS X (10.7.2), WD Elements 2.5tb external hd

Posted on Nov 8, 2011 6:27 PM

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Posted on Mar 12, 2012 11:40 PM

Fixed it. Have to pick a partition scheme (# of partitions) in the partition tab,


Then go to the bottom above the plus and minus signs and there's now a choice that says 'OPTIONS'


Open that and instead of "master boot record" which is chosen, pick "GUID Partition Table".


It'll work now.

20 replies
Question marked as Best reply

Mar 12, 2012 11:40 PM in response to Webdva

Fixed it. Have to pick a partition scheme (# of partitions) in the partition tab,


Then go to the bottom above the plus and minus signs and there's now a choice that says 'OPTIONS'


Open that and instead of "master boot record" which is chosen, pick "GUID Partition Table".


It'll work now.

disc erase failed with error invalid request

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