Unable to write to the last block of the device

I have an MacBook pro

my SSD was cleaned and I try to install new os x with recovery mode but I see this error when I try to Erase my SSD , what is the problems?

Posted on Oct 6, 2020 6:31 AM

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Posted on Oct 6, 2020 1:52 PM

The hard drive SATA cable on that model laptop has an extremely high rate of failure especially when using an SSD. You can confirm it by connecting the SSD externally using a USB to SATA Adapter, drive dock, or enclosure as suggested by @Grant.


Also make sure to try erasing the drive a second time immediately after you receive the error. I've seen a problem with Disk Utility where it will fail to erase a drive the first time, but will succeed on a second attempt made right afterwards.

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Question marked as Top-ranking reply

Oct 6, 2020 1:52 PM in response to MohamadrezaGol

The hard drive SATA cable on that model laptop has an extremely high rate of failure especially when using an SSD. You can confirm it by connecting the SSD externally using a USB to SATA Adapter, drive dock, or enclosure as suggested by @Grant.


Also make sure to try erasing the drive a second time immediately after you receive the error. I've seen a problem with Disk Utility where it will fail to erase a drive the first time, but will succeed on a second attempt made right afterwards.

Oct 6, 2020 7:04 AM in response to MohamadrezaGol

That generally indicates the device or its data cable has failed. Try it in an external enclosure to figure out which.


What MacBook Pro, by year, early mid late, screen size and processor speed?


Many with Internal cables can develop cable problems over the years, the rough inside of the machined case wears away the insulation and shorts out the cable, or the severe bends degrade over time and develop cracks. The common solution is to replace the cable when you replace the drive.

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Unable to write to the last block of the device

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