Thanks, just before i did the whole new fusion drive thing, i tried the bootcamp one more time, and now i managed to bring the 557gb back to life, but the disk1 does look a bit messy!
What i did was boot from the usb disk that bootcamp created, and formatted the disk1 before windows installation, then quit installation(i wish i can continue)........boot back to apple mac osx, use disk management, the missing 557gb now is back, all i have to do is simply format the disk back to apple journal....here is the diskutil list looks like, bit messy, but it works.....i guess i will do the fusion rebuilt before i sell the imac in the future.....
Last login: Wed Sep
5 12:23:55 on console
iMac-van-Yefei:~ studio5k$ diskutil list
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *121.3 GB
disk0
1: EFI EFI 209.7 MB
disk0s1
2: Apple_CoreStorage Macintosh HD 121.0 GB
disk0s2
3: Apple_Boot Boot OS X 134.2 MB
disk0s3
/dev/disk1 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk1
1: EFI EFI 209.7 MB
disk1s1
2: Apple_HFS 3.1 KB disk1s2
3: Apple_CoreStorage Macintosh HD 442.4 GB
disk1s3
4: Apple_HFS Files 557.4 GB
disk1s4
/dev/disk2 (internal, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Nick +557.6 GB
disk2
Logical Volume on disk0s2, disk1s3
BB21B839-F42B-46E7-A1E6-9FB1BACF8B89
Unencrypted Fusion Drive
