2008/10/27 Amanda Ward <[EMAIL PROTECTED]>:
>
> Hi All...
>
> I've been using some USB drives (Flash and "Real" Hard Discs) and
> something caught my attention. In disc utility a USB drive has 2
> entries... the first shows the drive with the manufacturer's name
> ie... Hitachi and it has a MS-DOS FAT Volume Format, the second entry
> seems to be like a partition that can have any format. The disc
> utility entry for the drive looks like this... (Missing the drive
> icons and comments, of course!)
>
> 18.6 GB HITACHI_DK23CA-20 Media <-Can't erase
>        USB Portable <- Can erase
>
> When I try to erase the actual drive, the top level, it never works...
> reverting to MS-DOS FAT. I can format the "partition" to anything Disc
> utility has to offer.
>
> Is this normal? It's no big thing... just trying to understand the
> nature of the beast! :-)
>
> Amanda

A hard disk can't be used "raw". It must be partitioned first, then
the /partition/ is formatted and that's where your data goes.

You're not seeing 2 entries side by side, you're seeing one inside the
other. One is the physical drive, the other is the partition on that
drive.


-- 
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