Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Difference between new and old drive Does anyone know the difference between the SE-S084B/RSBN and the SE-S084C/RSBN samsung drives?
Document: Samsung SE-S084B/RSBN External Slim USB DVD-Writer. It is the cheap price item to fit anyone pocket. However, you must be an expert using the computer and very patience, you could make it work. Moreover, you don't even think to give it up for loading its software into your laptop... that is my suggest... love you all and good luck ...
My PC was not capable of burning DVD's. After shopping around, I settled on the Samsung SE-S084B/RSBN External Slim USB DVD-Writer. The price was right and the description of the unit sounded like it would meet all my needs. It arrived quickly and in good condition. Installation was a snap, the included software a good supplement to my existing software and performance was perfect. I've used it several times since and it is still working flawlessly.
Please note Amazon description is incorrect. Samsung SE-S084B drive is not lightscribe. Other than that it is a good drive.
The Samsung SE-S084B External DVD Burner is perfect for traveling and where you can't get an additional power source.this drive can be powered trough a two headed usb plug,one for power and the other for data.It comes with the Nero 8.5 Essential software to burn music,photo albums,data till your own edited video's.It's light weight and gets easy in your 8.9 or 10 inch sleeve case of you notebook.
I have two very old Mac computers. My iMac is over 7 years old, and my iBook is almost 5-6 years old. Both of the DVD drives on them failed. The iBook drive lasted maybe 2 years, and I always thought I'd have to take it in and have the drive replaced. I took a chance, spent fifty bucks on this drive and hoped that it could play DVD's and write music CD's if possible.
The S084B dvd burner is a perfect fit for a netbook owner or anyone needing a usb-driven dvd burner.
This was purchased to add to my new netbook - Asus eee PC 1000HE. I too had problems installing the software. I still don't know if I have the current firmware version or not as the directions were confusing. One of the first install steps was to check the firmware version.
First of all, the installation again and again gave a timeout error message and no Windows installer appeared. I'd give up and try again. After four tries, I noticed that two Nero install managers (SE-S084B.exe) were running (using task manager).
I purchased this to use with my new netbook. Samsung was the cheapest external drive available and so far it has worked well. I need to use only 1 USB port even though it comes with a dual USB cable. Yet to try recording but everything else has worked.
I purchased the Samsung DVD writer to go with my ASUS Eee PC 1000HE as it does not have a built in CD or DVD drive. It works great with it and is light weight so you can travel with it. It was easy to install. I would recommend to anyone who needs an external DVD drive.
Answer: The C drive has a round eject button. It looks like the only other difference, according to the Samsung website, is the US-RW write speed is limited to 16x on the C drive.  The B drive can burn US-RW at 24x.