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Model A1297 Unibody: Early 2009, Mid 2009, Mid 2010, Early 2011 & Late 2011

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The speed of my Disk is about 450 Mb/s read and 150 Mb/s write

I have a question. The speed of my Disk is about 450 Mb/s read and 150 Mb/s write. (maybe because the disk structure of Catalina is with a virtual partition as read only, I do not know)

  • Model Name: MacBook Pro 17” Early 2011
    • Model Identifier: MacBookPro8,3
  • Processor Name: Quad-Core Intel Core i7
    • Processor Speed: 2.2 GHz
    • Number of Processors: 1
    • Total Number of Cores: 4
    • L2 Cache (per Core): 256 KB
    • L3 Cache: 6 MB
    • Hyper-Threading Technology: Enabled
  • Memory: 16 GB
  • Boot ROM Version:
  • SMC Version (system): 1.70f5
  • Sudden Motion Sensor:
    • State: Enabled

FYI: I did enable TRIM on the SSD

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Replace the HD for the new SSD. Maybe the problem is the SSD disk. It is a WD green 1Tb

In my test made with BlackMagic give 166 Mb/s - 415 Mb/s

But for the limitations with the read only disk, skip a lot test.

Before include my User from High Sierra, start up only in 20 seconds. Now it's about 45.

Product: 6 Series Chipset

  Link Speed: 6 Gigabit

  Negotiated Link Speed: 6 Gigabit

  Physical Interconnect: SATA

  Description: AHCI Version 1.30 Supported

WDC WDS100T2G0A-00JH30:

  Capacity: 1 TB

  Model: WDC WDS100T2G0A-00JH30

  Revision: UH510000

  Native Command Queuing: Yes

Queue Depth: 32

BSD Name: disk0

Medium Type: Solid State

TRIM Support: Yes

Partition Map Type: GPT (GUID Partition Table)

SMART status: Verified



Capacity: 209.7 MB (209,715,200 bytes)

File System: MS-DOS FAT32

BSD Name: disk0s1

Content: EFI

Volume UUID: 0E239BC6-F960-3107-89CF-1C97F78BB46B


Capacity: 1 TB

BSD Name: disk0s2

Content: Apple_APFS


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Your system offers two SATA ports:

  • The HDD port offers SATA III (6.0 Gb/s)
  • The Optical drive offers SATA III (by hardware report) but due to a timing issue within the logic boards PCH you can only use a SATA II (3.0 Gb/s) drive.

Which port are you using for your SSD? As well as who’s and its model and size.

Update (07/03/2020)

To start with I don't recommend APFS on SATA drives (HDD or SSD) the issue is the what SATA works Vs PCIe. SATA only has four buffers whereas PCIe has 16 or 32 buffers! Depending on the number of lanes x2 or x4 the drive offers.

So... The best thing we can do is backup your stuff and reformat the drive using macOS Sierra (10.12.x) while it can support High Sierra you’ll need to modify the OS installer so it does not convert the drive from HFS+ to APFS as it will magically do that without telling you! Is It Possible Not to Convert to APFS When Upgrading to High Sierra. Going anything higher it is no longer an option to stick with HFS+

Frankly, I would stick with Sierra as there are other issues within High Sierra that could mess you up.

Now the kicker!

Apple messed up the OS installer files If you've got an old macOS install image, it will probably stop working today

You’ll need to boot up under an external drive to remove the partitions and reformat the drive with GUID Journaled file system (HFS+)

Here are the fixed installers:

Jump to Step 4 make sure you grab the correct URL its the second one in the section.

Create a bootable OS installer using a USB thumb drive, following the correct instructions here:

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Francisco J D Rogers zal eeuwig dankbaar zijn.

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