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Mid 2012 model, A1278 / 2.5 GHz i5 or 2.9 GHz i7 processor.

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Hard drive cable A1278 model 821-1226-A instead of 821-0814-A

Hi, please i would like to know if there is any speed decrease or problems if i use this hard drive cable A1278 model 821-1226-A instead of 821-0814-A.

Macbook pro mid 2012 can use an old hdd cable , but i would like a confirmation that all will be good and there is no impact on performances,read/write datas speed etc...

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Before doing this highly dubious switch, you might want to read over this question: Using new hard drive cable in older machines 821-1480-A

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Thank you sir , but this doesn't solve my problem,i would like to understand the role of this cable , and informations about different cable models if you have them ,thanks

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We have test them and have no notice in decrease performance or issues running that cable as we have had a lot of troubles with the new cables failing a lot

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Who is "we"?

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They are different lengths, although some places will sell you the same cable for these two different part numbers. 821-0814-A is longer than 821-1226-A. I advise using the correct cable as extra stress on the cable will most likely mean it doesn't last as long as the correct one.

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faceofjock will be eternally grateful.
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