Why do I need to Reformat Disk for TM?

Have a new 24" IMAC, running 10.5.2. I have a hard drive that still has 400-500gigs left. When I plugged it in the first time to move images onto my IMAC, Time Machine gave me a warning that in order to use it as the back up drive I would have to reformat to extended and thus lose all my stored files. Why is that and is there a way around it? Why couldn't it just utilize existing space?
Then I figured I'd just buy another drive for Time Machine to back up. But I don't want to leave that drive connected all the time. I'd rather just plug it in and let it back up when it recognizes the disk. Will this work or is TM going to get "confused" with multiple disks being plugged and unplugged (I usually daisy chain them as well_?

question 1:
If your external drive is large enough, you can partition the drive.
To partition the external drive, what you need to do is open Disk Utility, select the external drive and go to partition. Select the size of the partition you want and make sure that it is formated correctly. Then you can have Time Machine use only one partition without erasing any of your data on the other.
Question 2:
Time Machine won't get confused and the backups are only working when the drive is connected. Besides, chaining the disks won't do anything more than make your iMac have to work a little bit harder to transfer the data from the port to the external drive. It's faster to have both connected to two different ports than chaining them.

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Dear all,
Here is my scenario.
We have extended RAC setup. Assuming everything is going fine and you have following status:
SQL> select MOUNT_STATUS,HEADER_STATUS,MODE_STATUS,STATE,NAME,FAILGROUP,PATH from v$asm_disk;
MOUNT_S HEADER_STATU MODE_ST STATE NAME FAILGROUP PATH
CLOSED FOREIGN ONLINE NORMAL /dev/rdisk/crs_vote2
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CACHED MEMBER ONLINE NORMAL FLASHDG_0000 FLASHFG1 /dev/rdisk/asm_arch1a
CACHED MEMBER ONLINE NORMAL DATADG_0000 DATAFG1 /dev/rdisk/asm_data1a
Now you shutdown one of the storages and have following status:
$ cd /u01/app/oracle/crs/log/hisdbs01/
$ ls
admin alerthisdbs01.log client crsd cssd evmd racg
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2008-06-14 17:00:05.710
[cssd(2757)]CRS-1604:CSSD voting file is offline: /dev/rdisk/crs_vote1. Details in /u01/app/oracle/crs/log/hisdbs01/cssd/ocssd.log.
2008-06-14 17:00:05.710
[cssd(2757)]CRS-1604:CSSD voting file is offline: /dev/rdisk/crs_vote1. Details in /u01/app/oracle/crs/log/hisdbs01/cssd/ocssd.log.
2008-06-14 17:01:05.720
[cssd(2757)]CRS-1604:CSSD voting file is offline: /dev/rdisk/crs_vote1. Details in /u01/app/oracle/crs/log/hisdbs01/cssd/ocssd.log.
2008-06-14 17:01:05.720
[cssd(2757)]CRS-1604:CSSD voting file is offline: /dev/rdisk/crs_vote1. Details in /u01/app/oracle/crs/log/hisdbs01/cssd/ocssd.log.
2008-06-14 17:02:09.241
[cssd(2757)]CRS-1605:CSSD voting file is online: /dev/rdisk/crs_vote1. Details in /u01/app/oracle/crs/log/hisdbs01/cssd/ocssd.log.
2008-06-14 18:14:37.660
[cssd(2757)]CRS-1604:CSSD voting file is offline: /dev/rdisk/crs_vote1. Details in /u01/app/oracle/crs/log/hisdbs01/cssd/ocssd.log.
2008-06-14 18:14:37.660
[cssd(2757)]CRS-1604:CSSD voting file is offline: /dev/rdisk/crs_vote1. Details in /u01/app/oracle/crs/log/hisdbs01/cssd/ocssd.log.
SQL> select MOUNT_STATUS,HEADER_STATUS,MODE_STATUS,STATE,NAME,FAILGROUP,PATH from v$asm_disk;
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CLOSED FOREIGN ONLINE NORMAL /dev/rdisk/crs_vote2
CLOSED UNKNOWN ONLINE NORMAL /dev/rdisk/asm_data1a
CLOSED FOREIGN ONLINE NORMAL /dev/rdisk/crs_vote3
CLOSED FOREIGN ONLINE NORMAL /dev/rdisk/crs_vote1
CACHED MEMBER ONLINE NORMAL DATADG_0003 DATAFG2 /dev/rdisk/asm_data1b
CACHED MEMBER ONLINE NORMAL FLASHDG_0001 FLASHFG2 /dev/rdisk/asm_arch1b
CACHED MEMBER ONLINE NORMAL FLASHDG_0000 FLASHFG1 /dev/rdisk/asm_arch1a
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8 rows selected.
sql> select MOUNT_STATUS,HEADER_STATUS,MODE_STATUS,STATE,NAME,FAILGROUP,PATH from v$asm_disk;
MOUNT_S HEADER_STATU MODE_ST STATE NAME FAILGROUP PATH
CLOSED FOREIGN ONLINE NORMAL /dev/rdisk/crs_vote3
CLOSED FOREIGN ONLINE NORMAL /dev/rdisk/crs_vote1
CLOSED UNKNOWN ONLINE NORMAL /dev/rdisk/asm_data1a
CLOSED FOREIGN ONLINE NORMAL /dev/rdisk/crs_vote2
CACHED MEMBER ONLINE NORMAL FLASHDG_0000 FLASHFG1 /dev/rdisk/asm_arch1a
CACHED MEMBER ONLINE NORMAL DATADG_0003 DATAFG2 /dev/rdisk/asm_data1b
CACHED MEMBER ONLINE NORMAL FLASHDG_0001 FLASHFG2 /dev/rdisk/asm_arch1b
MISSING CANDIDATE OFFLINE HUNG DATADG_0000
8 rows selected.
After you have verified that the state is "HUNG", you startup the storage
========================
$ cd /u01/app/oracle/crs/log/hisdbs01/
$ ls
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$ tail -f alerthisdbs01.log
2008-06-14 18:29:37.810
[cssd(2757)]CRS-1604:CSSD voting file is offline: /dev/rdisk/crs_vote1. Details in /u01/app/oracle/crs/log/hisdbs01/cssd/ocssd.log.
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[cssd(2757)]CRS-1604:CSSD voting file is offline: /dev/rdisk/crs_vote1. Details in /u01/app/oracle/crs/log/hisdbs01/cssd/ocssd.log.
2008-06-14 18:30:41.241
[cssd(2757)]CRS-1605:CSSD voting file is online: /dev/rdisk/crs_vote1. Details in /u01/app/oracle/crs/log/hisdbs01/cssd/ocssd.log.
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MOUNT_S HEADER_STATU MODE_ST STATE NAME FAILGROUP PATH
CLOSED FOREIGN ONLINE NORMAL /dev/rdisk/crs_vote2
CLOSED MEMBER ONLINE NORMAL /dev/rdisk/asm_data1a
CLOSED FOREIGN ONLINE NORMAL /dev/rdisk/crs_vote3
CLOSED FOREIGN ONLINE NORMAL /dev/rdisk/crs_vote1
CACHED MEMBER ONLINE NORMAL DATADG_0003 DATAFG2 /dev/rdisk/asm_data1b
CACHED MEMBER ONLINE NORMAL FLASHDG_0001 FLASHFG2 /dev/rdisk/asm_arch1b
CACHED MEMBER ONLINE NORMAL FLASHDG_0000 FLASHFG1 /dev/rdisk/asm_arch1a
MISSING CANDIDATE OFFLINE HUNG DATADG_0000
8 rows selected.
Now my question is WHY do we need to rebalance the asm_data1a MANUALLY because as per above scenario it needs rebalancing. Should not ASM do rebalancing itself?
Suggest solutions please.
Thanks a lot. Waiting for your expert opinions.
br,
Anjum

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