My portable hard disk get recognised when inserted, power is ok, it is not seen in the list of hard disks, I have 150gb data. can anyone help me to fix the problem pls

Go to Control Panel-> Administrative Tools-> Computer Management-> Storage-> Disk Management. See how many drives are visible. You should see your regular C Drive listed as "Disk 0" and your external hard drive as "Disk 1" (if Windows recognizes it.)

If it's Online, then right-click on Disk 1, and click on "Properties". Then click on the "Tools" tab, then click on the "Check" button.

If Disk 1 is listed as Offline, then right-click on the box that reads "Disk 1", then click "Online". Then, try to do a disk check as I noted above. Post back how it works out .

take out the hard disk,install it directly on your pc's sata interface.

Step 1:
When you connect an external hard drive or USB flash drive to your PC computer, the drive should appear in the "Computer" window. However, if the data on the drive is corrupted, you may receive an error saying that the disk is not accessible. In order to get the removable disk working again, you will need to boot up your computer using the Windows installation disk and then format the corrupted drive.
Connect the removable disk to your computer. Insert the Windows installation disk into your optical drive and reboot the system. Press any key on the keyboard when you see the prompt asking if you want to boot to the CD. Press "Next" and then click on the "I accept the license terms" button. Click "Custom" when the program asks you what type of installation you want to perform. Click on the "Drive options (advanced)" button. The next window will display a list of all the hard drives connected to your computer. The removable disk will appear, even if its data is inaccessible. Highlight the removable disk that you want to format and then choose the "NTFS" option. Click "OK" to clear the data and format the hard drive.

An external storage-device has four major components:

* the USB cable

* the power-adapter

* the disk-drive inside the enclosure

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

One of these components has failed.

Try a different USB cable.

Try connecting to a different USB port on your computer.

Try connecting to a USB port on a different computer.

Take a "multi-meter" and measure both the voltage and amperage output from the AC adapter, and compare with the specifications on the label on the adapter.

Open the enclosure, and remove the disk-drive, and then connect it as a "slave" disk-drive in a desktop computer, to see if it works at all.

Purchase a new, compatible, disk-drive, and install it in the enclosure, to "revive" your external storage device.

Get the part-number and serial-number from the label on your disk-drive, and access the manufacturer's web-site, and use "check warranty status", to see if they will replace the device, at minimal cost to you.

There exist commercial "data recovery" services that can try to repair your device, just long-enough to rescue and copy your files. For example, see: https://services.seagate.com/index.aspx?lng=en-US for a "no data - no charge" guarantee.

The lights signal data transfer so no lights = no transfer. It's clear that the hard disk inside your Passport has failed and, since it can't be repaired, all the data was lost and the unit is dead.
Buy a new one.

i have the same garbage external and almost the same problem, only i get 3 blinks of death every 4 seconds...

The drive has failed, Contact the manufacturer for a replacement and if u need the data back, contact a data recovery company :)

Assuming you are using a Cruzer Micro Drive with U3 Smart, things can be a little confusing because the drive actually shows up as two independent devices. When you insert the drive, there should be two devices showing up in your list of drives. One of them is installed as a CD Rom Drive and the other one is a Removable Drive. If you double click on the CD Rom Drive instead of the Removable Drive and you don't have any U3 applications mapped to the CD Rom Drive, then you'll get an insert disk message because Windows thinks that the CD Rom Drive is empty. Just use the Removable Drive if you want to simply install and transfer files.

If you cannot get the USB connection working, you can recover the data by taking the drive out of the case and connecting it directly to the PC as a second drive.  Make sure the jumper settings are correct for use as a second drive.  You can get the drive information and jumper settings from the web site of the drive manufacturer.

Drives do fail Nick. Is it powering up [power supply problem?] Plug it in and go to Start/Control Panel/Admin tools/computer management/storage/ removable storage and disk management. See if the disc is recognised there. If it is not, and if the disk is spinning Try putting it into the deep freeze overnight. Plugging in next morning and if it fires up get as much off as possible before it goes down again.