OpenSUSE Hardware :: Delay From Libata When Connecting ESATA?

I get some errors in dmesg and a delay as libata probes and tries to negotiate with my eSATA enclosure.

Some backstory to this adventure:My mainboard is an MSI K9AGM2-L with the AMD SB600 chipset providing the AHCI SATA controller for four ports, two of which (#s 3 and 4) are available.

A Rosewill RCR-AK-IM5002 internal card reader (manufacturer page missing) provides a SATA-to-eSATA adaptor port.

I wish to use a SAMSUNG Spinpoint M7E HM641JI 640GB 2.5" SATA hard disk drive externally. First, I had a Vantec NST-260SU-BK 2.5" SATA to USB 2.0 and eSATA enclosure. As explained in this forum post, all seemed well at first. But even though I got absolutely no visible errors, I could see (through hash checking and byte-by-byte comparisons) that writing (copying) to the external disk was not happening correctly. After exchanging the enclosure several times, I finally noticed that the retailer had a different (generic) brand, so I got one of those instead. (The particular unit I got was missing its screws; had a protrusion in its casing that obstructed the circuit board's seating; and caused even my mainboard's firmware to lock up when it was probed, twice, on each boot. A replacement with the same model remedied those three issues.)

Now we come to the present. The Comkia MM-G3BK-SUE MobiMe G3 2.5" SATA to USB 2.0 and eSATA enclosure (manufacturer page missing) doesn't seem to exhibit the writing issue (yet) -- hurray! However, it causes libata to struggle for fifteen seconds or so trying to connect when it is plugged in. (It also causes openSUSE to stall while booting for that reason.) Here is the output from dmesg:

Code:
[ 127.732765] ata4: exception Emask 0x10 SAct 0x0 SErr 0x40d0000 action 0xe frozen
[ 127.732770] ata4: irq_stat 0x00000040, connection status changed
[ 127.732774] ata4: SError: { PHYRdyChg CommWake 10B8B DevExch }
[ 127.732782] ata4: hard resetting link

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