Samsung posted the full specs of the SM-248F CD-RW drive. It supports 48X writing, 24X re-writing, 48X reading, 8MB buffer and Buffer Underrun technology... Key feature

·Buffer Under Run Free Technology
·High Capacity Buffer Memory:8MB
·Reduces noise and vibration with DVA(Dynamic Vibration Absorber)
·Supports variable packet CD-R, variable and fixed packet CD-RW read and write
·Supports Ultra DMA Mode 2

Specifications
Data Transfer Rate Record: 48X (7,200 KB/sec)
Rewrite: 24X (3,600 KB/sec)
Read: 48X (7,200KB/sec)
Burst Transfer Rate PIO Mode 4 (16.6 MB/sec)
DMA Mode 2 (16.6 MB/sec)
Ultra DMA Mode 2 (33.3 MB/sec)
Recording Capacity CD-RW Disc 700/650MB (type 80/74)
CD-R disc 800/700/650/550MB (Type 90/80/74/63)
Interface EIDE/ATAPI
Buffer Memory Retail Pack : 8MB, Bulk : 2MB
Drive Mounting Horizontal/Vertical
Average Access Time 110ms
Supported Disc CD-R/RW,CD-DA, CD-ROM/XA,CD-ROM, Video-CD, CD-I, Photo CD,CD-Extra,CD-TEXT
Audio S/N Ratio >75dB
Channel Separation >65dB
Writing Method DAO(Disc At Once), TAO(Track At Once), SAO(Session At Once), Multisession, Packet Writing (Variable, Fixed Packet)
Physical Specification Dimensions (WxHxD mm) : 148.2 x 42 x 184
Weight (kg) : 0.75