MacBook Pro :: No Write Access On Internal HDD?

Jun 21, 2014

I have a mid 2010 MacBook Pro. It's running almost daily since 2010 and now weird things happen after some uptime when I try to do stuff in Finder:

"The operation can’t be completed. An unexpected error occurred (error code -50)." and if I try to sudo: 

$ sudo ls

> sudo: Can't mkdir /var/db/sudo/username: File exists

> ... ls output ... 

Furthermore, I cannot do anything write-related anymore, no deletion of files in the Finder, no opening of webpages. Eventually, I have to force shut it down by holding the power button. 

I already wiped the HDD and reinstalled Mavericks from USB -- only to have this exact problem one day after setting everything up again. I even bought a new HDD, which worked quite well for a couple of days, only to result in the same error again. 

Additional info:

OS X 10.9.3
2.4 GHz Intel Core 2 Duo
8 GB 1067 MHz DDR3 (upgraded from 2 GB three years ago)
250 GB HDD / now 1 TB HDD
No dual boot / Bootcamp

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I have a late 2009 MacBook pro, running the latest version of Lion. Last week, I experienced a Kernel panic at start up, and was unable to launch the OS, even with the recovery boot. Starting in verbose told me that there was a sata issue. I opened the computer, replaced the internal hard drive with lion set upon it, and tried to start again, without any success. I bought a SATA-USB cable to plug my old hard drive. My computer is now running normally, but with the former internal hard drive plugged in USB.

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