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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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:

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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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).

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?

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.

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.

Commented:
what psu do you have installed

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