Help - Very Slow Transfer Speeds

Need some help here. I have been running into this issue and have yet to determine the cause for this. I am hoping someone here has an answer or can direct me to an appropriate place to get a solution.

My set-up: I have an HTPC internal SSD drive Windows 7. Connected via esata port multiplier is a Rosewill RSV-S4-X (4 bay HDD external raid case) equipped with two Seagate Barracuda Green ST2000DL003 2TB 5900 RPM 64MB Cache SATA 6.0Gb/s 3.5" hard drives. I do not have this set up as Raid - only as JBOD.

When things are running healthy, the transfer rates are pretty quick. Below is an output of the HDD transfer test from PC Wizard. When transfers are happening at the healthy rate, I can rip a movie from bluray to MKV in 30 minuites.

After a period of time (sometimes long periods of time, sometimes short), the transfer rate slows way down. I have ripped through several movies (10+) before with the higher transfer rate. There doesn't seem to be rhyme or reason for the slowdown, but when it happens it happens quickly. The only way I can describe it is that when I am burning a Blu-ray - for example creating a MKV (via MakeMKV) the data seems to come through in spurts. As I watch the transfer, it sputters or almost like data is transfered in small packets. With these slow rates, to burn the same Bluray movie takes well over 3 hours. Here is the same output from PC Wizard when the transfer rates are all goofy.

Now I have tried a bunch of things - restart, unplug, uninstall and reinstall drivers, etc. and nothing seems to fix the issue consistently. It seems like one thing will work and the transfer rates will get back to where they should be, but then after a bit it gets bogged down. I go through the whole process of restarting, unplugging, etc. Now its stuck at t he slow transfer rate and I cannot get it to go back. It's almost as if the data line is clogged (if that makes sense). I am racking my head on this because I cannot figure out what the issue is.

One thing is for sure - I know its not the Bluray drive. As a test, when the transfer was slow, I burned a movie to the internal SSD and it was lightning fast.

I'm thinking its a driver issue? the esata cord? I haven't set it correctly? I'm at wits end and about to scrap the external case and put all the drives internal - problem is I don't have a ton of HDD space to expand internally.

Any ideas - help?
3 answers Last reply
More about help slow transfer speeds
  1. Port multipliers can cause all kinds of strange issues, it sounds like it is being overwhelmed. Try adding a single drive internally and see if it still has issues.
  2. Right now I have the drives recognized as individual drives. If I were to go to a spanning set-up - do you think it would take care of this issue?
  3. Don't go JBOD, if you have a disk failure you will lose absolutely everything.
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