Summary: So far, this product has been horrible. Less than an hour of use, the drive started emitting a high pitched whine equal to the constant beep of a bad UPS battery or a cable resting against the blades of a processor fan.
Summary: This HDD does not work with SATA I Macs despite be listed as backwards compatible. Hitachi must have lost sight of consumer expectations. I bought a 500GB 2.5" HGST Travelstar Z7K500 7200RPM SATA SATA 7mm Notebook Drive with 32MB Cache model 0J26005 and the Mac would not recognize it. It was returned and the second one would not be recognized either. What a waste of time.
Summary: I purchased two of the HGST Travelstar Hdd for use with an Atomos Ninja-2 monitor/recorder. This particular model is one of the preferred drives for use in the Ninja. You should be very careful when installing this unit in the drive carrier provided with the recorder. The drive carrier is made from plastic and if you tighten the attachment screws too tightly you will not be able to remove the carrier easily.
Summary: I bought this used, as it was wiped clean by the Amazon seller. It took a bit to get my computer to see the drive. I gather that is because I am used to see only 1 jumper and this has 2. So after sorting thru all the options per my pc, I finally got it to work and used Acronis Disk Director to transfer my data from existing drive to this. Since then no issues.
Summary: I just received this drive today, and transferred my X220's /home filesystem over to it. Brought the machine up, and everything is going swimmingly. Fit perfectly inside the internal bay, without any case hacking. Hdparm clocks its read speed at over 120 MB/sec. SMART data shows no sector reallocation or anything else unexpected. I am very happy with this. Edit: Also, just checked 'hdparm -I' and dmesg output; it is in fact linked at SATA3 6.0Gbps speed. Lovely.