Document:	Storage devices performance

Copyright (c) 2007, Voipac Technologies a.s.


1. IDE HDD in PIO-4 mode, theoretical maximum 4 MB/s

# hdparm -tT /dev/hda                                                           
                                                                                
/dev/hda:                                                                       
 Timing cached reads:   234 MB in  2.01 seconds =116.21 MB/sec                  
 Timing buffered disk reads:  10 MB in  3.20 seconds =  3.12 MB/sec             
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2. IDE HDD in MWDMA2 (multiword DMA), theoretical maximum 16 MB/s

# hdparm -t /dev/hda                                                            
                                                                                
/dev/hda:                                                                       
 Timing buffered disk reads:  33 MB in  3.07 seconds = 10.74 MB/sec             
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3. MMC+ card in 4bit mode at 19.5 MHz, theoretical maximum 9.3 MB/s

# hdparm -t /dev/mmcblk0                                          
                                                                                
/dev/mmcblk0:                                                                   
 Timing buffered disk reads:   17 MB in 3.00 seconds = 5.66 MB/sec


4. MMC card in 1bit mode at 19.5 MHz, theoretical maximum 2.33 MB/s

# hdparm -t /dev/mmcblk0                                                        
                                                                                
/dev/mmcblk0:                                                                   
 Timing buffered disk reads:   7 MB in  3.44 seconds =  2.03 MB/sec             
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5. USB 1.1 flash disk, theoretical maximum 1.5 MB/s

# hdparm -t /dev/sda                                                           
                                                                               
/dev/sda:                                                                      
 Timing buffered disk reads:   3 MB in  3.20 seconds =958.83 kB/sec            
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6. CF card

# hdparm -t /dev/hdc                                                            
                                                                                
/dev/hdc:                                                                       
 Timing buffered disk reads:   8 MB in  3.41 seconds =  2.35 MB/sec             
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