Hi, i bought samsungssd 840 pro and it works fine, after upgrade to 10.8.4 i don't see intel x25-e ssd:
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 ssd 228.3 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
ls /dev/disk*
/dev/disk0 /dev/disk0s1 /dev/disk0s2 /dev/disk0s3
it is terrible.