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Hi guys,
I have MBP 2011 and after fresh installation macOS (High Sierra - boot from USB High Sierra install drive, erase SSD and made new installation of macOS ). It's look like it's slower than before (even the installation took longer than usual). But if I run Apple diagnostics it's everything OK.
Any ideas ? Thanks a lot :)
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You likely need a new HD cable! Sadly the original cables only supported the slower SATA II (3.0Gb/s) HDD Apple used originally. They later upgraded the cable a few times! The last version is able to support SATA III (6.0 Gbps) HDD's or SSD's. So I would start there MacBook Pro 13" Unibody (Early 2011-Late 2011) Hard Drive Cable and here's the guide MacBook Pro 13" Unibody Early 2011 Hard Drive Cable Replacement
Here's a bit more on the cable issue Your Hard Drive Cable Is A Ticking Time Bomb I only use one strip as that's all thats needed to hold the cable off the rough uppercase.
Even still there is still one more issue! Often I find people kill the new cable by damaging it! You can't crease the cable as that damages the thin foil wires within it. I use an old BIC pen ink straw (empty) to help me form a curl in the cable I don't want the radius of the cabal to exceed the diameter of the straw when the cable needs to bend around. And don't fold the cable at the connector either.
Lastly, I would recommend after you make the repairs, make a full backup, then format the drive and re-install the OS. If you haven't I would also start off making a bootable OS installer thumb drive (32GB) following this guide to speed things up How to create a bootable installer for macOS then restore your stuff as its likely you have a few corrupt files.
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But I didn't touch the cable at all :( I just erase the SSD and made new installation :)
I tried Blackmagic drive speed test and write is 50.2MB/s !!! and read is 470MB/s.
Same MBP with same CPU,RAM,SSD have 86MB/s and 486.9MB/s.
@roboscrap - Sure the test will run without any issues so it has to be something else! NOPE its the cable!!
Think it this way... Its midnight and you're driving down on the autobahn no traffic so you can push your car to the limit! Thats what BlackMagic is doing! Now its 7:30 AM and you're just crawling down the highway! Thats the difference, data flows are tricky, you can't always depend on synthetic benchmarks to prove or even disprove something.
Here we have years of experience and lots of others with the same issue and in every case placing the cable fixies things. Sometimes you do need to trust someone who's been at this a while.
@danj fair enough :) so if I replace the cable I should "get back" ? I will try swap the cable tomorrow and will see. Thanks a lot :)
@roboscrap - Make sure it's a new cable not used and not the older version!
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