I was copying a large amount of data - 65GB from the drive to a network drive and the USB cable was disconnected. After reconnecting some of the files sre on the network drive (~ 1/3) some are on the Lacie drive (~1/3) and others missing. Additionally none of the files on the network drive are on the Lacie drive

!! You have failed to provide a detailed problem. !!


External hard drives are plug-and-play devices used to store music, video and data files. Once the drive is connected, the computer checks its systems for the appropriate drivers, loads them, and the external drive is ready to use. If the computer does not recognize the external drive, plug it into another computer to ensure the drive is not corrupted. If the drive is good, a few simple steps should help re-enable the drive for use.
Switch the power button to "off." Disconnect the power cord from any extension cords or power strip, then re-seat the power cord into the hard drive. Connect the cord directly into an outlet and power up the drive. If the drive is powered and still not working, check the data cable. Power down the hard drive and disconnect the data cable from the computer. Wait 30 seconds to one minute. Reconnect the data cable and power up the drive. If the drive is not detected, power down the hard drive and connect the cable to a different port. Power up the drive. If the drive is detected but not working, check for a missing driver. Click on the "Start" button, right-click "Computer" and select "Manage." Enter your administrator password if requested. Select "Device Manager" and double-click "Disk Drives." Right-click the yellow exclamation point and install the missing driver. Close the Device Manager. If the drive is detected but not working check to ensure it has an assigned drive letter. Disconnect all devices connected by USB cables from the computer. Reconnect the drive's data and USB power cables directly into the computer. Click on the "Start" button, right-click "Computer" and select "Manage." Enter your administrator password if requested. Click on "Disk Management," right-click the external hard drive, click "change drive letter and path," and click "Add." Assign a drive letter. Avoid using A, B or C (C is usually assigned to the computer's internal hard drive). Click "OK" close the window. If the drive is detected but not working, check whether the drive is in sleep mode. Disconnect all devices connected by USB cables from the computer. Reconnect the drive's data and USB power cables directly into the computer. Click the "Start" button, right-click "Computer" and select "Manage." Enter your administrator password if requested. Select "Device Manager" and double-click "Universal Serial Bus Controllers." Double-click the first instance of "USB Root Hub" or "Root Hub." Check for the hard drive. If the drive is not visible, move to the next instance of "USB Root Hub." Continue checking each instance until the hard drive is located. Once located, click the "Power Management" tab and uncheck the "Allow computer to turn off this device to save power" box, click "OK," then close the Device Manager. Power the computer down, wait 30 seconds to one minute, and power the computer back up to ensure the drive is detected.

External hard drives are plug-and-play devices used to store music, video and data files. Once the drive is connected, the computer checks its systems for the appropriate drivers, loads them, and the external drive is ready to use. If the computer does not recognize the external drive, plug it into another computer to ensure the drive is not corrupted. If the drive is good, a few simple steps should help re-enable the drive for use.
Switch the power button to "off." Disconnect the power cord from any extension cords or power strip, then re-seat the power cord into the hard drive. Connect the cord directly into an outlet and power up the drive. If the drive is powered and still not working, check the data cable. Power down the hard drive and disconnect the data cable from the computer. Wait 30 seconds to one minute. Reconnect the data cable and power up the drive. If the drive is not detected, power down the hard drive and connect the cable to a different port. Power up the drive. If the drive is detected but not working, check for a missing driver. Click on the "Start" button, right-click "Computer" and select "Manage." Enter your administrator password if requested. Select "Device Manager" and double-click "Disk Drives." Right-click the yellow exclamation point and install the missing driver. Close the Device Manager. If the drive is detected but not working check to ensure it has an assigned drive letter. Disconnect all devices connected by USB cables from the computer. Reconnect the drive's data and USB power cables directly into the computer. Click on the "Start" button, right-click "Computer" and select "Manage." Enter your administrator password if requested. Click on "Disk Management," right-click the external hard drive, click "change drive letter and path," and click "Add." Assign a drive letter. Avoid using A, B or C (C is usually assigned to the computer's internal hard drive). Click "OK" close the window. If the drive is detected but not working, check whether the drive is in sleep mode. Disconnect all devices connected by USB cables from the computer. Reconnect the drive's data and USB power cables directly into the computer. Click the "Start" button, right-click "Computer" and select "Manage." Enter your administrator password if requested. Select "Device Manager" and double-click "Universal Serial Bus Controllers." Double-click the first instance of "USB Root Hub" or "Root Hub." Check for the hard drive. If the drive is not visible, move to the next instance of "USB Root Hub." Continue checking each instance until the hard drive is located. Once located, click the "Power Management" tab and uncheck the "Allow computer to turn off this device to save power" box, click "OK," then close the Device Manager. Power the computer down, wait 30 seconds to one minute, and power the computer back up to ensure the drive is detected. Hope this helps.
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If the computer does not recognize the external drive, plug it into another computer to ensure the drive is not corrupted. If the drive is good, a few simple steps should help re-enable the drive for use.
Switch the power button to "off." Disconnect the power cord from any extension cords or power strip, then re-seat the power cord into the hard drive. Connect the cord directly into an outlet and power up the drive. If the drive is powered and still not working, check the data cable. Power down the hard drive and disconnect the data cable from the computer. Wait 30 seconds to one minute. Reconnect the data cable and power up the drive. If the drive is not detected, power down the hard drive and connect the cable to a different port. Power up the drive. If the drive is detected but not working, check for a missing driver. Click on the "Start" button, right-click "Computer" and select "Manage." Enter your administrator password if requested. Select "Device Manager" and double-click "Disk Drives." Right-click the yellow exclamation point and install the missing driver. Close the Device Manager. If the drive is detected but not working check to ensure it has an assigned drive letter. Disconnect all devices connected by USB cables from the computer. Reconnect the drive's data and USB power cables directly into the computer. Click on the "Start" button, right-click "Computer" and select "Manage." Enter your administrator password if requested. Click on "Disk Management," right-click the external hard drive, click "change drive letter and path," and click "Add." Assign a drive letter. Avoid using A, B or C (C is usually assigned to the computer's internal hard drive). Click "OK" close the window. If the drive is detected but not working, check whether the drive is in sleep mode. Disconnect all devices connected by USB cables from the computer. Reconnect the drive's data and USB power cables directly into the computer. Click the "Start" button, right-click "Computer" and select "Manage." Enter your administrator password if requested. Select "Device Manager" and double-click "Universal Serial Bus Controllers." Double-click the first instance of "USB Root Hub" or "Root Hub." Check for the hard drive. If the drive is not visible, move to the next instance of "USB Root Hub." Continue checking each instance until the hard drive is located. Once located, click the "Power Management" tab and uncheck the "Allow computer to turn off this device to save power" box, click "OK," then close the Device Manager. Power the computer down, wait 30 seconds to one minute, and power the computer back up to ensure the drive is detected. Hope this helps.
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External hard drives are plug-and-play devices used to store music, video and data files. Once the drive is connected, the computer checks its systems for the appropriate drivers, loads them, and the external drive is ready to use.

If the computer does not recognize the external drive, plug it into another computer to ensure the drive is not corrupted.

If the drive is good, a few simple steps should help re-enable the drive for use.

Switch the power button to "off."

Disconnect the power cord from any extension cords or power strip, then re-seat the power cord into the hard drive.

Connect the cord directly into an outlet and power up the drive.

If the drive is powered and still not working, check the data cable.

Power down the hard drive and disconnect the data cable from the computer.

Wait 30 seconds to one minute.

Reconnect the data cable and power up the drive.

If the drive is not detected, power down the hard drive and connect the cable to a different port.

Power up the drive.

If the drive is detected but not working, check for a missing driver.

Click on the "Start" button, right-click "Computer" and select "Manage."

Enter your administrator password if requested.

Select "Device Manager" and double-click "Disk Drives."

Right-click the yellow exclamation point and install the missing driver. Close the Device Manager.

If the drive is detected but not working check to ensure it has an assigned drive letter.

Disconnect all devices connected by USB cables from the computer. Reconnect the drive's data and USB power cables directly into the computer.

Click on the "Start" button, right-click "Computer" and select "Manage." Enter your administrator password if requested.

Click on "Disk Management," right-click the external hard drive, click "change drive letter and path," and click "Add."

Assign a drive letter.

Avoid using A, B or C (C is usually assigned to the computer's internal hard drive). Click "OK" close the window.

If the drive is detected but not working, check whether the drive is in sleep mode.

Disconnect all devices connected by USB cables from the computer.

Reconnect the drive's data and USB power cables directly into the computer.

Click the "Start" button, right-click "Computer" and select "Manage."

Enter your administrator password if requested.

Select "Device Manager" and double-click "Universal Serial Bus Controllers."

Double-click the first instance of "USB Root Hub" or "Root Hub."

Check for the hard drive.

If the drive is not visible, move to the next instance of "USB Root Hub."

Continue checking each instance until the hard drive is located.

Once located, click the "Power Management" tab and uncheck the "Allow computer to turn off this device to save power" box, click "OK," then close the Device Manager.

Power the computer down, wait 30 seconds to one minute, and power the computer back up to ensure the drive is detected.

Hope this helps

Hi ajsallin ,

The problem could be resolved in the following ways :-

1. Loss of data could occur as a result of directly removing your USB external hard drive without actually disabling it from your taskbar's bottom right corner , where you get an icon of devices connected , it's like a plug icon.
2. You need to right click on the icon, choose the device that you want to remove and then disconnect it , till it says that you can now safely remove your hard drive.
3. Once you have done this , try connecting your hard drive , to the USB slot of the different PC, than the one from which you copied the data on your hard drive.
4. If the drive does not show up in my computer , it could be probably because you are using a USB hub or an extension cable to connect the hard disk.
5. I would recommend you to remove any such cables or USB hubs and try connect the hard drive directly to your USB port via the cable supplied with the hard drive.

Hope this helps.

An external disk-drive has four major components:

* the USB cable,

* an "internal" disk-drive inside the enclosure,

* a USB-to-disk-drive adapter inside the enclosure.

* a power-supply (only if the disk-drive is a "desktop" drive;
a "laptop" disk-drive gets enough power through the USB cable)

So,

* change the USB cable,

* try connecting to a different USB port,

* try connecting to a different computer,

* disassemble the enclosure, and remove the disk-drive.
Temporarily connect it as a "slave" disk-drive into a desktop computer, to see if bypassing that adapter bypasses the problem,

* get the model-number and serial-number from the label on the disk-drive, and access Samsung's web-site, to check the warranty-status of your specific drive. If the warranty still is valid, then exercise the warranty to get a replacement.

* if the disk-drive is out-of-warranty, purchase a new, compatible, disk-drive, and connect it into the case, to "reconstitute" your external device.

* if the data on your disk-drive is "important", search online for professional "data recovery" services. For a large fee, they can repair a "dead" disk-drive, just long-enough to copy all your files, and give you the copy.

Connect the Maxtor to a different computer, to see if the device works in some other computer.

If the warranty is still valid, exercise the warranty to get a replacement.

If the warranty has expired, disassemble the casing, and disconnect the USB-to-disk-drive interface from the disk-drive.

Connect the disk-drive as a "slave" disk-drive in some other computer, to see if the USB-to-disk-drive interface is the part that failed.

If all else fails, search online for commercial "data recovery services" -- for a large amount of money, they will disassemble the disk-drive, repair it, just long-enough to copy your files.

if the drive is internal, then it's time for replace. it will disc/rec when overheating.

if the drive is external and powered by usb port (or usb hub) check if the port has enough power. and if the cable to HD is a Y cable (one side to hd and two to usb ports, one for data, one for power). and dont connect two peripherals that need power from usb on same pc, like a hd and a dvd, they will rob energy one from another, both mailfunctionating.

The ThinkPad T21 is a laptop with a single drive bay.
You cannot setup this laptop with two hard drives in any RAID configuration.
You can add an external USB hard drive and copy/backup data to this hard drive.
OR
You can connect this laptop to a network and copy/backup data to another computer/server on the network.

THat means that there is something wrong with the drive already. I can transfer up to 100 Gig of a single file to large USB drives so generally transferring is not a problem. Try formatting the drive then transfer again. Or your USB port on your computer is only a USB 1.1 and not USB 2.0