Today i received WD Elements external drive. After connecting it to my laptop with Windows 7 and USB 2.0 i took windows like 5 min to find the drive and show it in Windows Manager. Then i tried to copy some files and 700 MB file copied in 15 minutes. Wow awfully slow! I tried this drive on some other laptop with Windows Xp, same situation, but this time Windows finds disc after couple of seconds.
Tried disconnecting and connecting drive for couple of times – no success. Then i find in my Windows 7 Control Panel/Device Manager/Drives option about buffering drive and turned it on (default is off) and now files are copying 20MB/s – that is acceptable. What is more now Windows finds drive after couple of seconds. So i am thinking i found the magic option that fixed everything so i turned the option off to check if i am right. Strange almost nothing changes, sure my transfer is almost half lower 13MB/s but Windows finds drive after couple of seconds and with this transfer it takes less than a minute to copy 700 MB file.
So here is my question
. What happened? After fighting with the drive for more than 2 hours i called the company i bought the disc from and made an appointment to return the disc tommorow. But now the disc works fine, they will check it and wont take it. I am not a specialist about hard drives but is it possible that only some sectors are damaged and after many tries of copying files it moved to sectors that are not damaged? Or maybe it takes some time for the hard drive to work at full speed after initial plug.
For now disc works fine, but i dont want to find out after a month that it is broken.
And another question. Copying files usually starts at 90MB/s but then transfer continuously drops to 20MB/s. Why?