Today an *Apple Certified Macintosh Technician* has installed an SSD into my iMac medio 2011. The iMac was born with an 1TB HDD but now a Crucial M4 SSD is also installed inside the mac. I've moved my OS X to the SSD using the [OS X Recovery][1], where the OS was installed using an Time Capsule Backup. Afterwards I did an *Erase* of the old HDD in *Disk Utility* to get the old OS removed and my data has now been transferred to new, clean partition. The name of the partition on the SSD is *Crucial M4 SSD* and the name of partition on my old 1TB HDD is *Storage*. Please see this output from *diskutil list*: iMac:~ dennis$ diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *256.1 GB disk0 1: EFI 209.7 MB disk0s1 2: Apple_HFS Crucial M4 SSD 255.7 GB disk0s2 /dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk1 1: EFI 209.7 MB disk1s1 2: Apple_CoreStorage 999.9 GB disk1s2 3: Apple_Boot Boot OS X 134.2 MB disk1s3 /dev/disk2 #: TYPE NAME SIZE IDENTIFIER 0: Apple_HFS Storage *999.7 GB disk2 First of all, it seems that the OS X Recovery was not installed on the SSD. Right? How can I recreate this? Then I'm wondering why the Apple_Boot is located on the old disk1. Shouldn't that be on the SSD as well? What is the difference between *disk1* and *disk2*? Please tell me, if anything else is looking strange. **EDIT1:** After I run the reinstaller, I get this output: iMac:~ dennis$ diskutil list/dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *256.1 GB disk0 1: EFI 209.7 MB disk0s1 2: Apple_HFS Crucial M4 SSD 255.2 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3 /dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk1 1: EFI 209.7 MB disk1s1 2: Apple_CoreStorage 999.9 GB disk1s2 3: Apple_Boot Boot OS X 134.2 MB disk1s3 /dev/disk3 #: TYPE NAME SIZE IDENTIFIER 0: Apple_HFS Storage *999.7 GB disk3 What is the EFI and Apple_Boot on */dev/disk1*? [1]: http://www.apple.com/macosx/recovery/