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My Ultrabook is an Acer Aspire S7-392 with 128Gb SSD. How I do you replace the 128Gb SSD with a 256Gb SSD. Which brand I can use? Can you give me procedure for replacement. Thanks.

You may want to look at this review: NoteBookCheck.Net - Acer Aspire S7-392 review. The SSD Acer is using in this model is a 256GB mSATA unit made by Kingston. So if we check the Kingston web site we find this drive: SSDNow mS200 Drive. While I can’t be 100% sure here, I think you can use the Kingston drive. Why don’t you give them a call to double check, I’m sure they can help you. Let us know what you find out. Make sure you make a full backup and review Acer’s info on restoring your OS on the new drive before you alter anything.