Data recovery - slow drive read - 3145kB/s

[alex4478]

Hi,

I'm running ddrescue in Ubuntu on a MacBook 6,1.

I know the data that was on the drive was 1.2TB (appx) and the amount of data rescued so far is 640GB, I'm prepared to wait (as it was impatience that has lead me to needing to recover the data) but ddrescue has a current average read rate of 2871kB/s, what is more interesting is the current rate never goes higher than 3145kB/s.

The MacBook uses USB2 ports and the HDD's are in USB3 enclosures.

I'm not looking to stop the process, even though ddrescue can read the log and carry on, but just understand why the highest rate is consistently 3145kB/s, which seems slow.

Thanks for any help.

[alex4478]

Thanks for the quick reply.

Whilst the data on the drive has great personal value (family photos etc) I'm not prepared to open up my MacBook to connect to the SATA/IDE interface, if it has any such connection in it.

The drive is a 3TB Western Digital (Elements) drive.

From 643984MB of rescued data the 'errsize' is 2148kB, or 0.000325%, but the number of errors is 45. So is that a high number, the size of errors would suggest it is not.

[alex4478]

That percentage could be 0.0335625%, kB and KB have confused me.