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Most likely the problem you are encountering is due to the RAID mode the device is set in. Most RAID arrays utilize multiple drives of the same size, or with drives of differing size, they just use a portion of the largest that matches the smallest drive. When the device rebuilt the array it partitioned off a portion of the 4tb drive of the same size as the existing 500gb drive. If you want to use full capacity of both drives you would need to use JBOD mode, which just strings the disks together into a storage pool using all available space. This won't offer the data redundancy of RAID1 or speed boost of RAID0, but should allow using full space.
Backup any vital data before doing anything, then look for a switch on the back. Rather than RAID0 or 1 the options may be labelled Safe or Fast, but JBOD is usually still labelled JBOD, or sometimes Big. You can try just flipping the switch to JBOD and seeing if it rebuilds to use all space. If that doesn't work you may need to remove the 4tb drive, connect it to a different system and erase it to get rid of the 500gb partition, then with the Lacie set to JBOD reinstall the 4tb drive so it will add its full size to the array.
The safest option though would be to buy another 4tb drive, backup all data and install both 4tb drives with the device set to RAID1/Safe. You would only get 4tb of total storage, but it would mirror the data on both drives so if one fails the other will still have your data. With JBOD you won't have any auto-backup. If a drive fails the data on it will be lost.
This error may indicate one of the several HD's that are in a Raid configuration is not spooling up or has corrupt data preventing a full startup. When it says "drive missing" that simply indicates inability to communicate with the drive.
If the failed hard disk drive is replaced with the exact same capacity, RPM and make of hard drive, then the array can be rebuilt. Raid 0 cannot be rebuilt as each drive contains half of the data, If RAID 1 then can be rebuilt as data on each drive is an exact copy. However if combination of RAID 0 and RAID 1 then can be rebuilt. It's best really to handel this hands on, I recommend taking it to a computer technicianespecially if the information on it is important.
You don't specify whether previously on your USB it was the same lacie external or whether it was a different external drive. It sounds like you were using a different external drive, most likely a single drive.
You've specified that you've got your lacie setup in raid 5. Raid 5 gives a very good read spead and a good redundancy for incase a drive fails, however it's write speed is very very slow.
It will be much slower than a single drive on USB for writing to it (i.e. backups), but you should see a huge performance boost in reading from the drive than your previous usb.
If you need it to be faster, you would be better suited looking at configuring it for one of the following raid setups:
Raid 0: striping (not recommended for backups) - data is split over all drives, however if 1 drive fails you lose all data.
Raid 10: striping + mirror . half the drives are striped (like above), but the other half mirror the striping half so if one drive fails there's a backup of it. You only get half the disk space though, so if you have 4 x 1Tb drives, then you'll only get 2Tb of space.
Hmmm, reseting worked on mine. Identical symptoms except light stayed blue, not red. Unable to power down. Before trying to get the drive working I got the data off using the procedure in the second post of this thread:
You need a linux system running. Maybe a live cd will do. I installed on an old IDE drive I had.
I then rest the decive using this procedure from Lacie and my drive is working again. Worthless though, because I can't trust it.
The procedure below will reset the 2Big Network to factory settings: IMPORTANT NOTE: Following the procedure below can ERASE ALL DATA on the drive. Prior to following these directions, verify important data is stored securely on a different storage device. Switch the drive OFF. Once it has shut down, ensure the power switch remains in the OFF position. If the drive is in the SAFE mode, move the RAID switch to the BIG mode. PRESS AND HOLD the button on the front. MOVE the power switch to the ON position. The light on the front of the drive will start blinking. Once the light stops blinking, RELEASE the front button. When released, it will begin BLINKING AGAIN. When it stops, PRESS AND HOLD the front button. The light will begin to blink again. When the light stops blinking, RELEASE the button. The drive is now resetting itself. Switch the RAID selector back to SAFE if desired. To
restore data if it was lost during the process, recreate the shares and
users on the unit prior to the reset. Any firmware updates applied will
need to be applied again.
You can use any brand or any size. It does not have to be a Lacie Brand Drive, but if you planning on using the RAID which makes an exact copy of one drive on the other drive in the server, you must pick two identical drives of the same brand and the same size. It can be any brand or size but both of the drives have to be identical. Otherwise, the RAID Will not work.
If you have any further questions, please let me know.