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What does SD stand for?

SD stands for Speed Disk (Norton Utilities)

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We have 158 other meanings of SD in our Acronym Attic

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Available in 500-GB and 1-TB models, G-Force GreenDrive external USB and eSATA disk drives utilize a variable speed disk mechanism that increases rotational velocity of the disk in response to host demand, resulting in virtually no performance degradation.
The Same Electrical Interface Systems Many systems need to have multiple generations of SCSI attached, some examples are Wide Ultra and Fast Wide SCSI high speed disks operating with CD-ROMs, CD-R, CD-RW, tape drives, removable media, and scanners that are Fast SCSI.