Internal hard drive replacement
What internal hard drive is compatible with my system?
iMac Intel 27インチ EMC 2309 (Late 2009, Core 2 Duo 3.06もしくは3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHzもしくは Core i7 2.8 GHz) ID iMac11,1
You’ll need to get a SATA II (3.0 Gb/s) compatible drive. Your options are either a HD, SSHD or SSD drive.
Depending on your current drive you may want to look at just adding a second drive in this case a SSD to give the system some zip! The easiest way is to swap out your optical drive for a special carrier and the SSD. Here’s the guide iMac Intel 27インチ EMC 2309/2374 デュアルドライブの交換 to follow and here’s the carrier 12.7 mm SATA Optical Bay SATA Hard Drive Enclosure
If your current HDD is failing then you could go with either a SSHD or SSD both offer better performance than a traditional HDD your system currently has. Here’s the guide to install it iMac Intel 27" EMC 2309 and 2374 Hard Drive Replacement. You will need this in-line thermal sensor as todays drives often don’t have the needed hookups for the system to access the internal drives sensor Apple was expecting OWC In-line Digital Thermal Sensor for iMac Late 2009 - Mid 2010 HDD or SSD Upgrade
OK so far we’ve talked about the two possible mounting options, lets talk about the needed drive. As I stated at the beginning your system requires a SATA II compatible drive. You’ll want to review the spec sheet of the drive you plan to use to make sure it lists SATA II (3.0 Gb/s) support. Many of todays drives are fixed SATA III (6.0 Gb/s) which will only work in a SATA III system. Some drives offer multiple SATA I/O support (we call these drives Auto Sense).
As an example here are two drives:
You’ll note both of these list 3.0 Gb/s on the interface line.
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