80Mb/s=10MB/s, think this could be your issue? :)
Oh, and I'll tag these on, because I can
[Vendor eBay *cough*]
[Name SanDisk Mobile Memory Stick PRO Duo™ 4GB]
[ProductID SDMSPD-4096]
Totalspace: 3883.000 MBytes
Freespace: 173.812 MBytes
[sector_size 512][sector_count 64][cluster_count 124256]
[Blocksize 0.5 KBytes] [RAW Write Speed 0.096 MBytes/sec]
[Blocksize 0.5 KBytes] [RAW Read Speed 0.644 MBytes/sec]
[Blocksize 2.0 KBytes] [RAW Write Speed 0.505 MBytes/sec]
[Blocksize 2.0 KBytes] [RAW Read Speed 2.840 MBytes/sec]
[Blocksize 32.0 KBytes] [RAW Write Speed 2.077 MBytes/sec]
[Blocksize 32.0 KBytes] [RAW Read Speed 9.287 MBytes/sec]
[Blocksize 1024.0 KBytes] [RAW Write Speed 2.265 MBytes/sec]
[Blocksize 1024.0 KBytes] [RAW Read Speed 10.252 MBytes/sec]
[Blocksize 0.5 KBytes] [FS Write Speed 0.068 MBytes/sec]
[Blocksize 0.5 KBytes] [FS Read Speed 0.825 MBytes/sec]
[Blocksize 2.0 KBytes] [FS Write Speed 0.100 MBytes/sec]
[Blocksize 2.0 KBytes] [FS Read Speed 0.827 MBytes/sec]
[Blocksize 32.0 KBytes] [FS Write Speed 0.822 MBytes/sec]
[Blocksize 32.0 KBytes] [FS Read Speed 7.116 MBytes/sec]
[Blocksize 1024.0 KBytes] [FS Write Speed 1.113 MBytes/sec]
[Blocksize 1024.0 KBytes] [FS Read Speed 9.394 MBytes/sec]
[PerformanceIndex 2.37]