Slow Write Performance

I'm back from my trip and still no update for -Current tree. I'm suspecting a new kernel will show up in the next batch of update as has been released by Greg few days ago.

Does any of you having a slow write performance when copying or moving files to and from flash disk or portable hard disk to your internal hard disk? I had this problem lately. This has never happened before. I'm not sure when exactly the changes in -Current changes this behaviour, but i'm suspecting a kernel misconfiguration (i used a custom kernel build, so it's not Slackware's fault if it's related to kernel) which is the root cause for this problem.

FYI, this happened in my laptop. I will post the output of hdparm -tT on my laptop tomorrow, but here is the output in my desktop. Can you give your output on the comment section for comparison?
Timing cached reads: 838 MB in 2.00 seconds = 418.52 MB/sec
Timing buffered disk reads: 306 MB in 3.01 seconds = 101.54 MB/sec

Update: Here's my output of hdparm -tT in my laptop
Timing cached reads: 2696 MB in 2.00 seconds = 1349.06 MB/sec
Timing buffered disk reads: 232 MB in 3.02 seconds = 76.89 MB/sec

Which is very strange. It nearly tripled in the first test, but it's slower in the second test. Does this proves anything to you guys?

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