You may have an issue with your system using a dual drive config. The issue is the optical drive SATA port has a timing issue which forces you to use a fixed SATA II drive within it. This is a MacBook issue not the carrier or the drives. Review this: [https://eshop.macsales.com/item/OWC/DDAMBS0GB/|OWC Data Doubler] locate your exact model and if it has a red note you'll need a different drive in the bay.
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As SW pointed out a common issue with the 13" models is the HD SATA cable breaks down so it interferes with the movement of the data, you'll need to replace it.
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As SW pointed out a common issue with the 13" models is the HD SATA cable breaks down so it interferes with the movement of the data, you'll need to replace it.
Here's the IFIXIT guide: [guide|10379] and here's the part you'll need: [product|IF163-041-2]. I strongly recommend you place some electricians tape when the cable rests in the uppercase to help prevent the rubbing on the rough aluminum case. Also don't over do the bends as the fold wires inside are fragile.
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I would redo your SSD's drives format and re-install the OS again, then restore your files from your backup.
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I would redo your SSD's drives format and re-install the OS again, then restore your files from your backup. As you're installing High Sierra you only have one choice GUID/APFS. If you want to compatibility with older systems you'll need to install Sierra instead then you'll have the older GUID/Journaled File System (HPFS)
You may have an issue with your system using a dual drive config. The issue is the optical drive SATA port has a timing issue which forces you to use a fixed SATA II drive within it. This is a MacBook issue not the carrier or the drives. Review this: [https://eshop.macsales.com/item/OWC/DDAMBS0GB/|OWC Data Doubler] locate your exact model and if it has a red note you'll need a different drive in the bay.
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As SW pointed out a common issue with the 13" models is the HD SATA cable breaks down so it interferes with the movement of the data, you'll need to replace it.
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Here's the IFIXIT guide: [guide|10379] and here's the part you'll need: [product|IF163-041-2]. I strongly recommend you place some electricians tape when the cable rests in the uppercase to help prevent the rubbing on the rough aluminum case. Also don't over do the bends as the fold wires inside are fragile.
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I would redo your SSD's drives format and re-install the OS again, then restore your files from your backup.
You may have an issue with your system using a dual drive config. The issue is the optical drive SATA port has a timing issue which forces you to use a fixed SATA II drive within it. This is a MacBook issue not the carrier or the drives. Review this: [https://eshop.macsales.com/item/OWC/DDAMBS0GB/|OWC Data Doubler] locate your exact mode and if it has a red note you'll need a different drive.
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You may have an issue with your system using a dual drive config. The issue is the optical drive SATA port has a timing issue which forces you to use a fixed SATA II drive within it. This is a MacBook issue not the carrier or the drives. Review this: [https://eshop.macsales.com/item/OWC/DDAMBS0GB/|OWC Data Doubler] locate your exact model and if it has a red note you'll need a different drive in the bay.
You may have an issue with your system using a dual drive config. The issue is the optical drive SATA port has a timing issue which forces you to use a fixed SATA II drive within it. This is a MacBook issue not the carrier or the drives. Review this: [https://eshop.macsales.com/item/OWC/DDAMBS0GB/|OWC Data Doubler] locate your exact mode and if it has a red note you'll need a different drive.