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<blockquote data-quote="WayneF" data-source="post: 325981" data-attributes="member: 12496">I have no clue, it certainly seems very surprising.&nbsp; Both cameras have a USB 2.0 port themselves, but if using a card reader instead, which camera would no longer be any factor.&nbsp; They are just files, and the card reader does its own thing. The D4S files are slightly larger, but does not seem enough to matter much.&nbsp;&nbsp; But all else equal, then the computer is surely involved in the speed though, guessing some difference in procedure?&nbsp; But another question is why the fastest was only 30 MB/second?&nbsp; &nbsp; That is the USB 2.0 speed limitation, and about 30 MB/second is all we will ever see on a USB 2.0 port or reader.&nbsp; USB 3.0 should be much faster, I see around 110 MB/second with a Lexar USB 3.0 reader&nbsp; (Win7, D800, 73 files, each file about 35 MB, 2.36 GB total).Here is a free USB card speed test:&nbsp;&nbsp; <a href="http://usbflashspeed.com/" target="_blank">UsbFlashSpeed.com: We know everything about USB Flash speed!</a>It will test and show USB card and reader speed.&nbsp; USB speed will vary drastically with block size accessed, which it shows.&nbsp; Possibly each camera could format the card a bit different, but I really doubt it myself.Looks like this:&nbsp;&nbsp; (green is read speed, red is write speed).&nbsp;&nbsp; Card is Lexar 1000x compact flash.<img src="http://www.scantips.com/lights/images/usb.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Chkdsk would show formatting block size&nbsp; (in a command window, on the card reader drive):C:\&gt;chkdsk g:The type of the file system is FAT32.Volume NIKON D800 created 6/26/2014 11:47 AMWindows is verifying files and folders...File and folder verification is complete.Windows has checked the file system and found no problems.&nbsp;&nbsp; 31,252,352 KB total disk space.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 32 KB in 1 hidden files.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 64 KB in 2 folders.&nbsp; &nbsp; 2,485,472 KB in 73 files.&nbsp;&nbsp; 28,766,752 KB are available.&nbsp; &nbsp; &nbsp;&nbsp; 32,768 bytes in each allocation unit.&nbsp; &nbsp;&nbsp; &lt;&lt;-------------&lt;&lt;&lt;&lt;&nbsp; &nbsp; &nbsp; 976,636 total allocation units on disk.&nbsp; &nbsp; &nbsp; 898,961 allocation units available on disk.</blockquote>

[QUOTE="WayneF, post: 325981, member: 12496"] I have no clue, it certainly seems very surprising. Both cameras have a USB 2.0 port themselves, but if using a card reader instead, which camera would no longer be any factor. They are just files, and the card reader does its own thing. The D4S files are slightly larger, but does not seem enough to matter much. But all else equal, then the computer is surely involved in the speed though, guessing some difference in procedure? But another question is why the fastest was only 30 MB/second? That is the USB 2.0 speed limitation, and about 30 MB/second is all we will ever see on a USB 2.0 port or reader. USB 3.0 should be much faster, I see around 110 MB/second with a Lexar USB 3.0 reader (Win7, D800, 73 files, each file about 35 MB, 2.36 GB total). Here is a free USB card speed test: [URL="http://usbflashspeed.com/"]UsbFlashSpeed.com: We know everything about USB Flash speed![/URL] It will test and show USB card and reader speed. USB speed will vary drastically with block size accessed, which it shows. Possibly each camera could format the card a bit different, but I really doubt it myself. Looks like this: (green is read speed, red is write speed). Card is Lexar 1000x compact flash. [IMG]http://www.scantips.com/lights/images/usb.jpg[/IMG] Chkdsk would show formatting block size (in a command window, on the card reader drive): C:\>chkdsk g: The type of the file system is FAT32. Volume NIKON D800 created 6/26/2014 11:47 AM Windows is verifying files and folders... File and folder verification is complete. Windows has checked the file system and found no problems. 31,252,352 KB total disk space. 32 KB in 1 hidden files. 64 KB in 2 folders. 2,485,472 KB in 73 files. 28,766,752 KB are available. 32,768 bytes in each allocation unit. <<-------------<<<< 976,636 total allocation units on disk. 898,961 allocation units available on disk. [/QUOTE]

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