Is it possible to replace the SATA CD-ROM to SATA HDD\SSD on the dell R610

1: You should have no problems swapping existing disks for your own disks, as long as they're of the same interface

2: Unless something has drastically changed, empty drive bays have blank faceplaces installed to improve airflow, but do not come with empty drive carriers. You will have to order the drives from Dell to fill them, or get them from Ebay. I believe your R410 is newer, so you'll have more difficulty. You might be able to find resellers by searching Google.

3: No particular problems jump out with the exceptions of reliability and performance hits if you only have one spindle. If you purchase additional drive carriers and use a RAID layout, you'll get better performance (if you plan your RAID right, anyway) than is possible with only one drive. Not to mention that single-drive failure in your situation would seriously cramp your style.

In my experience the errors you're seeing are actually hardware errors reflected in software. The 'lost page write due to I/O error' message is one I've seen with bad hard-drives, and it behaves similar to how you describe when attempting to fsck it. This is almost definitely a true hardware fault.

You should check the output of smartctl to see what it says could be problem.

smartctl --attributes /dev/sdb

It'll give you output similar to this:

=== START OF READ SMART DATA SECTION ===
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED     RAW_VALUE
  1 Raw_Read_Error_Rate     0x000f   200   200   051    Pre-fail  Always       -       0
  3 Spin_Up_Time            0x0003   212   186   021    Pre-fail  Always       -       4358
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       97
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000f   200   200   051    Pre-fail  Always       -       0
  9 Power_On_Hours          0x0032   066   066   000    Old_age   Always       -       25420
 10 Spin_Retry_Count        0x0013   100   253   051    Pre-fail  Always       -       0
 11 Calibration_Retry_Count 0x0013   100   253   051    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       86
194 Temperature_Celsius     0x0022   104   001   000    Old_age   Always       -       46
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0012   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0010   200   200   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x003e   200   200   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x0009   200   200   051    Pre-fail  Offline      -       0

The output can be arcane, but the one I'd pay close attention to would be Reallocated_Sector_Ct, since that tells you what the HD has for known bad sectors. The command 'smartctl -a' will give a lot more data. On the bad HD I had a while back, the bottom of that output is the 'SMART Error Log' which had a few entries.