Chosen Solution
Hi there, I have a I/O error problem after I installed an SSD to the original HDD bay of my MBP. Model: MacBook Pro7.1SATA II Year: 2010CPU: Intel Core 2 DuoOS X 10.8.5RAM: 4GB SSD: Samsung SSD 840 EVO 250GB (compatible with both SATA III 6GB/s and SATA II 3GB/s)Model: MZ-7TE250BWFirmware Revision: EXT0BB0Q Bought a new Samsung EV0 840 (non-pro) installed as the main drive to my MacBook Pro 13" model 7.1, with SATA II. Installed Trim Enabler (Groths.org). From the very beginning for a couple of weeks the disk was producing I/O errors, sometimes even did not boot correctly. After a couple of weeks the SSD was dead. Sent it back and received a new replacement. After installing a new one, no matter whether enabled TRIM through Groths or Chameleon app I ran Blackmagicdesign Disk Speed Test and had again I/O errors after about 1-5 mins of the drive test. I disabled TRIM and the test went well for about 4 hours, but then again had the I/O error. After the I/O error had to take the SSD out, connect it externally via USB and run Disk Warrior to repair it to be be able to use it again. After days of trials I gave up and put an old HDD back. Now testing the old one to see if the error still persist… It has been quite a nightmare and I am thinking of either the MBP being dead, SATA cable to be replaced or the motherboard (logic board) dead…. Anyone experiencing similar issues? Any ideas about a potential cause of the I/O Error? Is Samsung 840 Evo 250 GB just a wrong pick and I should have chosen a different SSD? Thank you very much
I/O errors are often a bad cable. Apple and some third parties had a bad run of cables. I would start off replacing the SATA cable its self. I would also make sure you have the latest EFI firmware installed as well. Follow this Apple TN EFI & SMC firmware updates for Intel-based Macs. Update The SATA I/O from your device and the given SATA standard your system offers are not the same so the device needs to adjust its SATA I/O to the speed of your system in this case SATA II (3.0Gb/s). While the Samsung EV0 840 sates it can work with SATA I or SATA II systems it needs to do this with the handshake the device does with the SATA controller. Some controller chips did have some problems handshaking correctly which is why you needed to update the systems firmware. As to why the SSD has an issue where as the the HD doesn’t has a lot to do with the speed of the data going across the SATA interface. (cable & connectors). As I stated Apple did have a problem with some versions of the cable which is the most likely issue here now that you had already the most current EFI & SMC firmware. Just to be clear here you have this drive as a replacement of your HD and not using it in a carrier replacing the optical drive - Correct?
