Dynex DX-CRMN1 - Mini Memory Card Reader/Writer User Manual page 8

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Caution: Formatting a memory card permanently deletes all files on
the card. Be sure that you copy any valued files to a computer before
formatting a memory card. Do not disconnect the card reader or
remove the memory card while formatting is in progress.
Formatting a memory card (Macintosh)
If your computer has trouble recognizing a new memory card, format the
memory card in your device or by using the computer.
To format a memory card:
1
Click Go, then click Utilities.
2
Launch Disc Utility.
3
In the left-hand column, select the memory card you want to
format, then click the Erase tab.
4
Specify a volume format and name for the memory card, then
click Erase. A warning box opens.
5
Click Erase again. The Erase process takes a minute or so to erase
and reformat your memory card.
Caution: Formatting a memory card permanently deletes all files on
the card. Be sure that you copy any valued files to a computer before
formatting a memory card. Do not disconnect the card reader or
remove the memory card while formatting is in progress.
Using your card reader