How many of you have custom-installed (internal) SSDs in your (any model year/variant) Macbook Pro ? (i.e. the SSD didn't come with the MBP, you installed it yourself) I'm particularly interested in the mid-2009 13" MBP model (mine) and the Crucial MX300 275GB SATA SSD (soon to be mine), but no matter what your MBP/SSD model, please answer. The more your specs match mine, the better, but I'll take any info I can get. Please note - I'm only interested in the SATA SSD's not the PCIe ones. I ask this because I've read reports of 2009 Macbook Pros not properly negotiating SATA link speeds when replacing a HDD with certain SSDs. People with SATA II interfaces (3 Gbps) are seeing the negotiated link speed as SATA I (1.5 Gbps) thus limiting the SSD even though twice that speed is possible. In a nutshell, the SSD is SATA III, the MBP supports SATA II, but is only allowing SATA I. Please answer any/all of the following, to the best of your ability. Gratitude. - Is the SATA interface (specified by your MBP model) you're using for your SSD a SATA I, II, or III ? i.e. is the max speed (aka "link speed") 1.5, 3, or 6 Gbps ? - What is the negotiated link speed of your SATA interface for the SSD ? This can be found in the System Report > Hardware > SATA. System Report can be reached through the "About this Mac" dialog. - If your interface is SATA I (1.5 Gbps) or SATA II (3 Gbps), what kinds of speeds are you seeing from your SSD (sustained I/O, random 4K, etc) ? The more info you can provide, the better. - What are your system specs (model year/number/variant e.g. "mid 2009" or "5,5" , OS major/minor version, SSD model and capacity) - Have you installed the SSD in the main HDD bay or the optical drive bay (in newer Macs, optical may not apply) ? - Are you booting from the SSD or is it a secondary drive ? Final Q - If your negotiated link speed is/was lower than your max link speed, how did you solve this problem ? I've ordered a Crucial MX300 275 GB SSD and am trying to do my homework before the drive arrives, so I can sort out any potential issues expeditiously upon arrival and before the return period expires. Thanks !