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Released June 2009 / 2.66, 2.8, or 3.06 GHz Core 2 Duo Processor

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New hard drive will not format

I just installed a new hard drive into my system and I’m currently booting off of a USB using El Captain. Problem is, it fails to erase the drive giving me a few different reasons for not being able to but the most common one is, wiping volume data to prevent future accidental probing failed, is there a way to get around this?

The first aid check says drive is good. I’ve also tried to do it using terminal and I mostly get and error for unable to write to the last block of device.

Any ideas on what I’m either doing wrong or what I need to do to get this drive to format

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Is this a compatibility issue?


no it ended up being a just being a bad hard drive cable once it got replaced the hard drive i had bought ended up working


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Did you make sure the SSD is SATA II compatible? The MCP79 (9400M) machines aren’t compatible with Fixed III drives. You need a Autosense II/III drive at the bare minimum for this machine.

In addition to the MCP79 not being SATA III compatible and needing a SATA II compatible SSD, we’ve often found the HD cable is at fault. You need to get a 2012 cable, put electrical tape where it rests and tape it down to the optical drive so it doesn’t move. Refer to this guide.

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I didn’t buy a solid state drive. I bought one of the standard drives that ifixit recommended for that computer. As to the the hard drive cable is that something that I could test to see if I needs to be replaced or is that 2012 one needed just to upgrade to solid state


The Seagate drives iFixit sells are Fixed III. Which one did you buy?


i bought a toshiba 500gb sata drive

500 GB 5400 RPM 2.5" Hard Drive


@pnaples92 It's a Fixed II drive, so that's not the issue. I would change the HD cable out and see if that helps then. 9 times out 10 it fixes it.

Most people with this issue put a Fixed III SSD in, so that's where that assumption came from.


ok i will get one of those ordered and see if that helps, Should i also buy an external sata and use my other computer to format that drive in case that cable doesn't fix the issue?


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