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1.4GHz or 1.6GHz Processor, 64GB or 128GB SSD.

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Why does my SSD only works when connected when connected via usb?

I have had my new OWC 250 gb SSD installed in my macbook air a1730 for 2 years and out of no where one day I go to turn on my mac I get a blank grey screen with the flashing question mark file. After much trouble shooting I have found out that when I removed the drive and connect it via usb it my computer is the only way it can be found. I am able to use it and open anything on the drive when its uninstalled but when I place it back in to the computer it is unable to find it. I have performed the following tasks

1. tried to restore from time machine but cannot locate the 250gb drive to load it too

2. installed factory 60gb dive and everything works fine

3. when trying to verify newer 250 ssd my computer is unable to find any problems with it so I cant repair it when in disk utility.

I thought it might be my I/O cable but since my old drive when connected internally my computer works fine.

I cant imagine my 250gb drive is bad because it works and performs fine... only when connected usb.

I am out of options and I do not have extensive computer experience but I catch on quick. If anyone has any solutions PLEASE help me out. I need my bigger drive for work and I really do not want to buy another expensive SSD.

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1 Answer

Most Helpful Answer


Try to make the updated firmware to your SSD.

Look the video in down page.

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It says the drive needs to be installed internally befor I do anything else. Why does it matter? If I'm running my Mac off the bad drive via usb. Will I be able to update the firmware while its not installed internally?


No, it's not possible to do so by USB.

You must create a bootable USB key and put the SSD internally and start the key.

Follow the video in web page as I indicated to you earlier.


Think of it this way the shoe cobbler can't resole your shoe with you in them ;-} Which is why you need to use a different drive to boot up with.

But I'm not sure if updating the systems firmware About EFI and SMC firmware updates for Intel-based Mac computers or the SSD's (OWC SSD update Anthony pointed you to) will make a difference here.

You talk about a drive cable are we talking about a MacBook Air model you have indicated here or a different model altogether? If it's the older model with a SATA cable then I would suspect the cable is bad. Here is the guide for the 13" MacBook 2010: MacBook Pro 13" Unibody Mid 2010 Hard Drive Cable Replacement


Exactly Dan the cable may be a problem but, normally in the Macbook Air 2010 is a PCI-type connector, not a SATA for SSDs.


@thonyf - I think he got his systems mixed up which is why I pointed to the cable (he stated cable in his reply).

You are correct! Most of the Airs use a plug-in blade SSD unit directly on the logic board (no cable). The first & second generation 13" did use a cable to a SATA HD or a SATA SSD. Assuming he got the year correct I suspect he has a MacBook Pro 13" system Vs an Air. Which is why I referenced it.

Here's the MacBook Air A1237 or A1304 SATA drive replacement (with cable): MacBook Air Models A1237 and A1304 Hard Drive Replacement The first 13" Air came out in 2008.


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