Why is my external hard drive not recognised?

January 7, 2011 at 21:27:23
Specs: Windows 7

If I boot up my computer, it can't detect the connected external hard drive however, it will if I remove and reconnect the eSATA connection.

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#1
January 7, 2011 at 23:59:36

You may not be giving the system enough time during bootup to detect the drive. It could also be issues with your startup services. The best thing to do when things stop functioning correctly on the computer and a simple reboot does not resolve it, is to restore the hard drive using your restore discs or load a fresh copy of your operating system. Make sure to backup your files before doing so.

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#2
January 28, 2011 at 10:16:01

Woul I lose all my applications on the computer, like SKYPE, MS applications like Outlook, Excel...?

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#3
January 28, 2011 at 12:06:06

"You may not be giving the system enough time during bootup to detect the drive. "

Some bios Setups have a setting where you can set a time delay regarding detecting hard drives while booting. If your bios version has that, try setting that to a longer time than it is presently set to, Save bios settings.

Check your eSATA data cable.
The connector on each end should "latch" into the socket on the drive and on the socket on the computer - it should not move when you merely brush your hand against it near the socket - if it does, mere vibration can cause a poor connection of it - use another eSATA data cable that does "latch", or tape the connector in place.
(There is a slight projection or bump on one side of the outside of the connector that "latches" it into the socket - it's easily broken off or damaged)

If in doubt, replace the eSATA data cable. They are a standard item and are available locally if you live in a reasonably sized location.

"....restore the hard drive using your restore discs or load a fresh copy of your operating system."

Both of those things are a very last resort and are almost always completely un-necessary, especially to cure merely a problem detecting an external hard drive.


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Related Solutions

#4
January 31, 2011 at 12:25:40

I have tried the device on my both systems XP ans Vista. Also I have tried other devices like Clickfree(which I sugest to get everyone)
During the disconection and reconection of the Seagate the system dont recordnize the device. The other devices are recornized on both systems without problem. The cable wire I used were the same on all devices and still the system is not recornised despite the fact that if I went to system manager it's there but no letter apears in My computer. Please advice. Thanks

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#5
January 31, 2011 at 13:21:23

Armoy

If you are not the same person as Snorcrow (some people lately have had to make a new user name for whatever reason using a different email address and there may be two names for the same person in the same Topic) , and if you're connecting the external drive via a USB connection, then you need to made aware that the info in response 3 applies only to eSATA connected drives.

USB connected drives are another matter.

Troubleshooting USB device problems including for flash drives, external drives, memory cards.
See Response 1:
http://www.computing.net/answers/ha...

Check that out first.
......

Rarely, not all the ports on the back of a desktop case may be able to supply 500ma each.

If you have a desktop computer, Note that I answered a Topic on this site where a guy had an external drive, which does require the full 500ma, connected to a port on the back of a desktop case - it would not work properly when a webcam was in the port next to it, but it worked fine when the webcam was unplugged. Ports on the back of a desktop case often have two ports connected to the same USB controller module that are ports one above the other - you could try connecting the cable to one of those and leaving the other un-used.
......


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#6
February 2, 2011 at 19:23:01

Tubesandwires

I checked out my bios and I couldn't seem to find any settings for external detection. I've got bios version F. 17 if that's any help.
I also doubt it's a problem with cable connection as recognition isn't lost if I try to wiggle the connectors.


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#7
February 2, 2011 at 21:33:13

Snorcrow

An eSATA connected drive is not an external drive the same way a USB or Firewire connected drive is. eSATA is merely away of connecting a SATA drive outside of the case to an internal SATA connection, whereas the other two have to go through the much slower USB or Firewire interface. It should show up in the bios the same way as an internally connected SATA drive does. The bios doesn't need any special feature to detect an eSATA connected drive.

If in doubt, replace the eSATA data cable. They are a standard item and are available locally if you live in a reasonably sized location.


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#8
February 3, 2011 at 06:18:01

Snorcrow

If your external hard drive enclosure is combo USB / eSATA, I found this info in the directions for mine:

"Connect the eSATA cable BEFORE connecting the USB cable to the enclosure, or the enclosure will default to USB.
* You need to connect the USB cable to draw power from either your PC or Laptop."

The eSATA connection is for data only. The power for the enclosure's circuits / the hard drive inside it is provided by the USB cable.

The USB port you plug into MUST be one that the external drive can work properly with when plugged into, and the connection MUST be able to supply the full USB spec 500ma. See response 5.
........

Out of curiousity, I tried connecting my combo USB / eSATA external drive via a eSATA connection.

With the AC power to the case ON, the computer off, I connected the eSATA cable between the computer and the enclosure - no led lit up on the external enclosure - then I connected the USB cable between the computer and the enclosure - an led came on, on the external enclosure.
(Note that for my external enclosure, the led will bink if the USB port cannot supply 500ma, or if there is some other problem with being connected to that USB port.)
Then I booted the computer (into Vista), eventually a message popped up saying a device had been detected - the name and model of the external enclosure's circuitry. Then a message said installing software for it or similar. I looked in Computer and the three partitions on the eSATA connected drive were there. I looked in Device Manager and under Disk drives the hard drive model of the drive inside the external enclosure was listed and had the icon for a removable (external) drive. I looked in Disk Management - the hard drive model inside the external enclosure was there, and the three partitions on it were shown.
There was a message window on the desktop screen that said I need to restart Windows because of changes made or similar (the external enclosure's circuits being detected and software - drivers - having been installed for it) so I did that, and while booting I went into the bios Setup - the hard drive model inside the external eSATA connected enclosure is listed there.


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