[HELP/URGENT] Cannot access/copy data

[joenedz]

I've been using my QNAP TS-409 since 2010 with no hardware issues.
Last sunday (15/1) we've got this error :

[RAID5 Disk Volume: Drive 1 2 3 4] Examination failed.
[RAID5 Disk Volume: Drive 1 2 3 4] Start examination.
/share/Qdownload is not ready for Download Station.
The default share Qweb is not found. Apache httpd start failed.
[RAID5 Disk Volume: Drive 1 2 3 4] RAID device is inactive.
[RAID5 Disk Volume: Drive 1 2 3 4] Hot-remove drive 1 failed.
Drive 1 plugged out.
[RAID5 Disk Volume: Drive 1 2 3 4] RAID device is inactive.
System started.
The system was not shut down properly last time.
[RAID5 Disk Volume: Drive 1 2 3 4] Start rebuilding.
[RAID5 Disk Volume: Drive 1 2 3 4] Recovering journal.
[RAID5 Disk Volume: Drive 1 2 3 4] Drive 4 has been added into Volume 1.
System started.
The system was not shut down properly last time.
[RAID5 Disk Volume: Drive 1 2 3 4] Rebuilding done.
[RAID5 Disk Volume: Drive 1 2 3 4] Start rebuilding.
[RAID5 Disk Volume: Drive 1 2 3 4] Drive 4 has been added into Volume 1.
The default share Qweb is not found. Apache httpd start failed.
/share/Qdownload is not ready for Download Station.
[RAID5 Disk Volume: Drive 1 2 3 4] Volume is in degraded mode.
[RAID5 Disk Volume: Drive 1 2 3 4] Drive 4 has been removed.
Drive 4 plugged out.


Current firmware version: 3.3.0 Build 0924T
I use 4 x 1TB Seagate 7200 rpm SATA with RAID 5


I tried rebooting, but it's still in the same state. What should I do??
I have submitted online support on QNAP Website, hope that any engineer can pull out my important data back without any LOSE data,
before it crash. Please!

[Crush]

Drive 1 has gone bad, replace it.

[joenedz]

I think Drive 1 and 4 has gone bad at the same time (gosh!)
Is replacing Drive 1 and 4 will return back all the data?

[joenedz]

After remoted by QNAP Engineer, he also gave up to fix and give suggestion to recover my data to some recovery vendor
And I did, successfully recover all the data.
Now I'm very concern with data on NAS, then I bought Storageworks server to replace the NAS..