Mid 2010 Model A1278 / 2.4 or 2.66 GHz Core 2 Duo processor

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running slow even after formatting

Hi all,

My MBP had been running very slow for a while - beachballs, apps taking forever to open etc. So i backed up, deleted the HD and formatted, reinstalled Yosemite (it was running slow on Mavericks also). I only put a few apps back on but its is still as slow as ever. Its a bog standard machine, no upgrades. Any help much appreciated

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Is this the original HD that was in the system or a replacement drive? If it's a replacement can you give us the make and model info for the drive. Also how much memory do you currently have in the system these newer OS's tend to need a bit more that the baseline of 2GB some of these systems had when new.


Yes Dan, its the original HD with 249.2gb and 223.56gb free. Its got 4gb RAM and is at 2.7gb when awake with no apps open.


After following the advice of Dan, my MBP which was driving me mad due to its sluggishness has been restored to its former self. I didnt realise that to repair the disk you had to be 'off' that disk. I've verified and repaired the disk and permissions many a time but it didnt speed my MBP up at all. But now its running great. Thanks Dan and ABCellars


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Do you have an external drive to boot up your system? If not you'll need to create one.

I think your disk has some bad sectors. Using your external drive run Disk utility and see what SMART services say. You may need to completely wipe down the drive and run the write ones & zeros test so your system can map out the bad sectors. It maybe time for a new drive ;-{

Let us know how it goes

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Sorry Dan, gonna hold my hands up and admit i havent a clue what you mean. I have an external hard drive connected to my iMac which i use to occasionally back up the MBP if thats any good.


Do you have a spare USB thumb drive? If so lets use it. Using the OS installer format and install the OS on to it. Then pressing the Option key when rebooting you'll get to the startup manager. There select the USB drive to boot up from.


Dan, i have a thumb drive with Yosemite on it. I used it when i completely reformatted it quite recently. Is this what you mean? Do i not need to wipe anything or back up.

Thanks for your patience.


Then you're all set here. Boot up with it and then run Disk Utility to repair the permissions & the disk it's self you'll likely need to run both a few times.


Back up prior to moving forward. When you format the drive thru disk utilities with ones and zeros you will wipe all information off the drive. This will also prevent data from being written to the bad sectors on your hard drive. The most likely cause of your system being slow, is information written on bad sectors on your aging hard drive. You really might consider getting a new hard drive, within a year you will be going through similar or worse. Hard drives are cheap, data is irreplaceable.


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