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i don't know what happend but i cannot acces my drive like it was before. i was using samba and twonky media server but now they don't work . what i can do to repair it. i can acces it via putty and also the webinterface. the SMART info looks like this:

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SMART Attributes Status
Id   Attribute Name   Flag   Value   Worst value   Threshold   Type   Status   Raw data
1   Raw_Read_Error_Rate   0x000f   084   083   006   Pre-fail   Ok   45590898
3   Spin_Up_Time   0x0003   094   092   000   Pre-fail   Ok   0
4   Start_Stop_Count   0x0032   088   088   020   Old_age   Ok   12626
5   Reallocated_Sector_Ct   0x0033   097   097   036   Pre-fail   Ok   4320
7   Seek_Error_Rate   0x000f   078   060   030   Pre-fail   Ok   67008170
9   Power_On_Hours   0x0032   082   082   000   Old_age   Ok   16019
10   Spin_Retry_Count   0x0013   100   100   097   Pre-fail   Ok   0
12   Power_Cycle_Count   0x0032   100   100   020   Old_age   Ok   292
183   Runtime_Bad_Block   0x0032   100   100   000   Old_age   Ok   0
184   End-to-End_Error   0x0032   100   100   099   Old_age   Ok   0
187   Reported_Uncorrect   0x0032   001   001   000   Old_age   Ok   2382
188   Command_Timeout   0x0032   099   099   000   Old_age   Ok   3 26 26
189   High_Fly_Writes   0x003a   100   100   000   Old_age   Ok   0
190   Airflow_Temperature_Cel   0x0022   055   036   045   Old_age   In_the_past   45 (Min/Max 31/45 #8964)
191   G-Sense_Error_Rate   0x0032   100   100   000   Old_age   Ok   0
192   Power-Off_Retract_Count   0x0032   100   100   000   Old_age   Ok   230
193   Load_Cycle_Count   0x0032   048   048   000   Old_age   Ok   104117
194   Temperature_Celsius   0x0022   045   064   000   Old_age   Ok   45 (0 13 0 0 0)
197   Current_Pending_Sector   0x0012   099   001   000   Old_age   Ok   296
198   Offline_Uncorrectable   0x0010   099   001   000   Old_age   Ok   296
199   UDMA_CRC_Error_Count   0x003e   200   200   000   Old_age   Ok   0
240   Head_Flying_Hours   0x0000   100   253   000   Old_age   Ok   9284h+42m+19.222s
241   Total_LBAs_Written   0x0000   100   253   000   Old_age   Ok   54132959024139
242   Total_LBAs_Read   0x0000   100   253   000   Old_age   Ok   249300220121766

Indeed your disk health is not very good :

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1   Raw_Read_Error_Rate   0x000f   084   083
5   Reallocated_Sector_Ct   0x0033   097   097
7   Seek_Error_Rate   0x000f   078   060

Usually the value of attributes is 100 or 200 so you have at least some bad blocks

Currently I think the firmware failed to mount the data volume because its fs is corrupted (surely by bad blocks)
To confirm this post the output

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mount

you should not have the mount line for sda8 and you should have some errors in dmesg output

If it is missing, try to do

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e2fsck -y /dev/sda8

mount:

/dev/sda2 on / type ext3 (rw,relatime,data=ordered)
none on /proc type proc (rw,relatime)
none on /sys type sysfs (rw,relatime)
none on /dev/pts type devpts (rw,relatime,mode=600)
/dev/sda5 on /rw_fs type ext3 (rw,noatime,data=ordered)
tmpfs on /rw_fs/tmp/usr/var type tmpfs (rw,relatime,size=5000k)
nfsd on /proc/fs/nfsd type nfsd (rw,relatime)
/dev/root on /lacie-boot type ext3 (rw,relatime,data=ordered)


e2fsck -y /dev/sda8:

e2fsck 1.42.11 (09-Jul-2014)
/dev/sda8: recovering journal
Error reading block 243751358 (Attempt to read block from filesystem resulted in short read). Ignore error? yes

Force rewrite? yes

Error reading block 243751359 (Attempt to read block from filesystem resulted in short read). Ignore error? yes

Force rewrite? yes

/dev/sda8 has gone 2191 days without being checked, check forced.
Pass 1: Checking inodes, blocks, and sizes
^C/dev/sda8: e2fsck canceled.
root@DanielNAS:/ # e2fsck -y /dev/sda8
e2fsck 1.42.11 (09-Jul-2014)
/dev/sda8 has gone 2191 days without being checked, check forced.
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Free blocks count wrong (60325934, counted=57525400).
Fix? yes

Free inodes count wrong (121825861, counted=121825805).
Fix? yes


/dev/sda8: ***** FILE SYSTEM WAS MODIFIED *****
/dev/sda8: 71155/121896960 files (44.6% non-contiguous), 430031285/487556685 blocks

Thank you. It worked
I will try to back up and buy a new drive.

Happy new year!