I have the same problem (but not in Windows 7, I have it in XP and Vista)...
Samsung SH-203N (TSSTcorp CDDVDW SH-S203N ATA Device)
For one, my IDE/PATA port has died on my motherboard, I have tried going through Gigabyte but they sent it back saying everything is fine... so I just do not use anything PATA anymore, only SATA.
Second, the problem I have that matches yours is not in Windows 7 but actually in XP and Vista x64 (I have 3 OS for now).
What I did to fix it was 2 things:
1) removed some stupid EA DRM crap from a game that was causing problems on my computer (Spore or CnC3)
2) download and install and update the firmware for this drive. I currently have Firmware SB01, it was SA00 before. You can get the firmware from the Samsung website
Now for my IDE problem, here is what it shows in my XP right now:
the letters change everytime I remove it from Device manager or restart the PC