HDD not detected

More than likely, this is some sort of fault in the logic of the external enclosure. The solid light indicates that the drive is powered and is awaiting access while the blinking light means that it is busy working. If you are unable to get the drive to do anything (whether reading data from the drive or storing data to the drive), then I would guess that it is time to see whether you still have warranty coverage on the drive and, if so, get it replaced under warranty.

In my experience, I have found that Toshiba drives are very unreliable and therefore would recommend that you replace it with a Seagate if this drive no longer has any warranty coverage. Of all the drive manufacturers, I have found Seagate drives to be the most stable and reliable. Others may recommend Western Digital but I replace failed Western Digital drives on a constant basis in my computer repair business each and every week while Seagates keep on going. I base my recommendation on being in business now for over 25 years.

***Please NOTE***
Touch the drive and put your ear to it, to test if the drive is spinning and working. Do this while it is powered on. Also, try disconnecting the USB cable, reboot the computer, re-connect USB cable to another USB port on computer. If you still have the same issue, try the below solutions.

• Make sure the computer and external hard drive are powered on.
• Disconnect the external drive's USB or the eSATA cable, which ever one you're using.
  
• Disconnect the power supply plug from the external drive.
• Power off the computer.
• Disconnect the computer's power supply cord for 60 seconds.
• Reconnect the computer.
• Power on the computer.
• Connect the power supply to the external drive.
• Connect the drive's USB or the eSATA cable and check for detection.

If the still no detection and still blinking lights on the drive, check the power supply to the drive.
Check to see what the led light on the power supply is doing.
If it's blinking, power down the drive, unplug data cable and then reconnect the power supply to another electrical outlet. If it still blinks repeatedly, then you power supply is bad.
If the led is solid (lit and not blinking) follow the same steps from above to connect it to another outlet.
Next, plug the power supply to the external drive and power it up.
If the power supply starts to blink repeatedly, then your controller board inside the enclosure is bad.

Thank you for the opportunity to help you.

just install seagate free agent using this link

http://www.seagate.com/ww/v/index.jsp?locale=en-US&name=goflex-software&vgnextoid=11c1fab114b48210VgnVCM1000001a48090aRCRD

then try again if problem not solved, mail me to tsnp@ymail.com

be sure power is supplied to the HDD, if and inter HDD change the cables, if is external check the USB cable and see if you need a complementary power brick or a second USB to power it.

Turn your computer off.
Disconnect the power cord.
Disconnect all other disk-drives and CD/DVD drives, leaving only the "suspect" drive connected.
Restart your computer, and enter BIOS SETUP, and see if the drive is detected, and how it is connected (primary/secondary, master/slave).

Read the model-number and serial-number and manufacture-date on the disk's label,
and access Seagate's web-site, to check the warranty-status of the drive.
If the warranty is valid, Seagate will replace the drive, at minimal cost to you.

Search online for a professional "data recovery service". For a significant fee, they can repair your disk-drive, just long-enough to copy your files to a new disk-drive.

you can install even if it is a slave disk. also you can try setting the jumpers to master mode, check the sides of the hdd, it has a jumper setting and set it to master, using the shorting pin, just plug it out and connect it to the right setting

Below is the address of Seagate Service center in Bangalore.

ACCEL Frontline Ltd, No: 18/8,
Saleh Centre, Cunnigham Road,
Bangalore - 560052
Karnataka.
Ph: 080 66279903
You can reach them online @ http://myservice.accelfrontline.in/WRMS/


Regards
Manish

It could be your USB or firewire. i had a problem with my h drive and now i'm using a ps3 usb cable instead

First check if other usb data drive like is pen drive is getting detected. Check all the usb ports. Check the Seagate drive with other computer if you have.Restart the system in safe mode and check.Try to create new admin account and check .If also chck the usb cable to make user it is not defective. If nothing works probably your hdd is gone bad. Good luck.

I'll put it like this; The fact that it's and Ultra ATA 100 interface and that it's a 5400 RPM drive is somwhat of a concern.. Don't know if your laptop will support the 5400 RPM speed, but the good news is,it won't hurt your laptop to try it.
Also, I don't think the Ultra ATA 100 interface will be a problem, maybe require you to change BIOS setting (maybe).