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Windows 7: transfer rate from hd to hd slows right down!

21 Jul 2011   #11

Windows 10 Pro. EFI boot partition, full EFI boot

Quote   Quote: Originally Posted by mikemeadeuk View Post
Hi, I am transfering them from internal drives using SATA2 drives 7200rpm.

It does actually transfer at around 600MB per second, because when I transfer all 10 over to the other drive, the first 1GB file finishes in about 2 seconds and I can open it up etc and its all fine, the next file takes longer, and the 3rd takes even longer etc etc.

Not sure why its fast to start with and then slows off
The first is probably cached in memory and not fully flushed to disk yet and when you read it, you are reading it from the memory cache. As your memory cache fills with the backlog of writes, you slowi down to the drive rate

7200 rpm disks can only do about 150 MB/s maximum, and their onboard cache is limited to about 64 MB - you cannot write at 600MB/s to disk with that large of a file.

My System SpecsSystem Spec
21 Jul 2011   #12

7 home premium 64bit

Ah ha! That makes sense!

So why does it not do this for all 10 files? I have 16GB of memory so 10GB will be easily doable?

My System SpecsSystem Spec
21 Jul 2011   #13

Windows 10 Pro. EFI boot partition, full EFI boot

The cache is of limited size. I don;t know what it is offhand.

I am not sure I believe my explanation. I will have to think about it a little more. I am sure that if the file is in memory you can read it back from there, but I think it would need to be flushed to disk before you can read it.
My System SpecsSystem Spec

21 Jul 2011   #14

MS Windows 7 Ultimate SP1 64-bit

your fastest transfers will be when you use RoboCopy to transfer files.

Robocopy is a command built into Win 7.
My System SpecsSystem Spec
21 Jul 2011   #15

Windows 10 Pro. EFI boot partition, full EFI boot

Quote   Quote: Originally Posted by GeneO View Post
That sounds about right for disk to disk. It usually is about 1/2 the slowest drive speed. The estimate of the speed starts out optimistic. You can't expect a rate that is faster than a disk drive can deliver.
No, think I was right. I don;t believe a write flush to disk is required before reading the file from cache.
My System SpecsSystem Spec

 transfer rate from hd to hd slows right down!

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