HDD Dissappears after a while/slow transfer rate on Windows 7.

marpanet
marpanet used Ask the Experts™
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I have a Windows 7 64bit with 500GB on the OS, then I added 2TB hard drive (Hitachi) to the system (for movies and stuff) and when it was full I added another 2TB hard drive (samgsung) for more movies and more stuff, recently I have been having this weird error.

Suddenly the hard drive dosen´t show on Windows/My Computer nor in Disk Management and I can´t access it, but if I reboot Windows it will appear once again, but when I want to transfer some information it starts at 100Mb/s but then falls to 1Mb/s, and after a while it won´t show up again.... I did a HD Tune test when it was available and the results where perfect, but then after 5 minutes the HDD dissapeared once again. I updated the BIOS and nothing happened, what can it be????.. can you help me?

Thank you,
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IanTh
Commented:
try chaging the sata lead

or it could be power related as your psu masy not have enough umph to run all the drives
Top Expert 2013
Commented:
willcomp

Commented:
Another possibility is an overheating drive. For 3 HDDs, you need a reasonably large case (mid tower or larger) and good air flow around the hard disks. As IanTh stated, you also need adequate power.
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marpanet

Author

Commented:
Ok, I will try all solution, another weird thing....
When it´s working, I try to copy a large file 1.6GB from my C:\ to the one I´m having problems, and it starts very fast, but then it always get´s slow at the same point (when I have 880MB left to copy) and stays at the same state everytime I try to copy a file (different files).

jcimarron
Top Expert 2013

Commented:
marpanet--If this is a long download, it could be that your ISP is conserving bandwidth so other users will not be affected. Ask them.
Are you running other tasks during the download?
marpanet

Author

Commented:
jcimarron, it´s when I am copying a large file from one internal HDD to another internet HDD, it doesn´t have anything to do with network copying.
marpanet

Author

Commented:
I will give both the points..... actually I still don´t know what it was..... I just changed the SATA cable for a new one and change the SATA port, I don´t know if the SATA cable was damaged or the SATA port was damaged, I don´t think it´s a PSU problem because now it works well, still I am going to change it.
IanTh

Commented:
what psu do you have installed

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