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Need help with External HD........

Joined
Oct 24, 2010
Messages
118
Motherboard
X58A-UD5
CPU
i7-930
Graphics
HD 6870
Mac
  1. iMac
  2. Mac Pro
Mobile Phone
  1. iOS
I have a WD 2TB in an External enclosure (Rosewill RX385 V2) connected at the back panel (USB/Esata) combo port via Sata connection.The drive shows up as Internal an i can Mount/Unmount it without problems......
The issue is that if i unmount then Power off the External case,then power it back on under system profiler it changes from
JMicron JMB363 AHCI:

Vendor: JMicron
Product: JMB363 AHCI
Link Speed: 3 Gigabit
Negotiated Link Speed: 3 Gigabit
Description: AHCI Version 1.00 Supported
TO
JMicron JMB363 AHCI:

Vendor: JMicron
Product: JMB363 AHCI
Link Speed: 3 Gigabit
Negotiated Link Speed: 1.5 Gigabit
Description: AHCI Version 1.00 Supported

I've just ran a few disk tests using SpeedTools (Attached) but it has not really proved that performance has dropped by half which i guess is what suppose to happen given what SP reports :crazy:
Has anyone came across this issue? Could it be just a Bug? Where exactly in Console should i look for clues? Any opinions/suggestions would be great.....Bless
 

Attachments

  • Storage G2TB Results.txt
    2.6 KB · Views: 75
  • Storage G2TB Results(re-Mount).txt
    2.6 KB · Views: 55
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