Maybe it's easier for you to disconnect the HDD and look at the interface to make sure. From Toshiba SDD homepage:
Rotational Speed of 5,400rpm
Fluid Dynamic Bearing (FDB) motor drive
12ms Average Seek Time
100MB/sec Transfer Rate
300,000 MTTF Hours
*Toshiba defines a megabyte (MB) as 1,000,000 bytes and a gigabyte (GB) as 1,000,000,000 bytes.
2.5" Super Slimline (9.5mm) HDD 60GB*
Toshiba America Information Systems, Inc. (TAIS), Storage Device Division introduces the MK6022GAX 2.5-inch 60GB Hard Disk Drive. The MK6022GAX offers the industries highest areal density per platter, at 49.8 gigabits per square inch. The drive's 5400 RPM motor speed, improves system-level performance by as much as 12 percent when compared to 4200 RPM drives.
This new drive offers enough capacity for portable video recording and editing, with lower power consumption compared to the traditional 3.5-inch HDDs. This functionality provides ideal storage for a range of commercial and consumer notebooks, as well as non-PC applications such as PDAs, printers, copiers, GPS systems and MP3 players. The MK6022GAX is ATA-5 compliant, supporting high transfer rates of up to 100 megabytes per second.
It says 16MB. If Toshiba Satellite notebook HDDs don't need buffer memory, why would Toshiba add 16MB when even most desktop computers use SCSI and SATA HDDs with just 2 to 8MB buffer?
As for 5:01 burn time, either the size is smaller than 4.7 billion bytes or the software is reading it uncorrectly.
BTW, your notebook also seems to report there IS 16MB buffer memory in your Toshiba HDD.
Buffer-to-Host Data Rate 100 MB/s
Buffer Size 16 MB
Spin-Up Time 4 sec
Your "tech" at Toshiba probably didn't know what you were asking about.