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.
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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Hello:
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
Volumes:
EFI:
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
disk0s2:
Capacity: 1 TB
BSD Name: disk0s2
Content: Apple_APFS
crwdns2934271:0crwdnd2934271:0 Francisco J D Rogers crwdne2934271:0