2DD Floppy disks

Can a standard floppy drive read a 2DD disk?

I don't have any double-density (2DD0 720-KB floppy disks to check, but it should if
it's a standard 3-1/2" internal floppy drive.

What is the storage capacity of my floppy diskette? -
http://www.indiana.edu/~sakaikb/help...all&docid=adox
--
Glen Ventura, MS MVP Shell/User, A+
http://dts-l.org/
http://dts-l.org/goodpost.htm


"b11_" wrote in message
...
Can a standard floppy drive read a 2DD disk?

b11_ wrote:
Can a standard floppy drive read a 2DD disk?

B11:

Yes IF the disk was created on a PC. NO if it was created on an older
Apple computer.

http://en.wikipedia.org/wiki/Floppy_disk#Compatibility

Note: there may be software utilities to allow a PC to read/write to
an Apple floppy.

HTH & GL

John

--
\\\||///
------------------o000----(o)(o)----000o----------------
----------------------------()--------------------------
'' Madness takes its toll - Please have exact change. ''

John Dulak - Gnomeway Services - http://tinyurl.com/2qs6o6

On Thu, 21 Jun 2007 16:14:01 -0700, b11_
put finger to keyboard and composed:

Can a standard floppy drive read a 2DD disk?

There should be no problem. The 720KB diskettes are usually formatted
with 9 sectors/track, whereas the 1.44MB diskettes have 18
sectors/track. Both have 80 tracks. One requires a greater write
current than the other, and this is indicated by the second hole in
the jacket (people used to try for 1.44MB from a 720KB diskette by
covering up this hole).

The problem with disc compatibility arises in old 360KB 5.25"
diskettes when used in both 360KB (40 track) and 1.2MB (80 track)
drives. This is due to the latter's narrower track widths, which means
that a 1.2MB drive cannot completely erase the wider tracks written by
a 360KB drive.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

"Franc Zabkar" wrote in message
...
| On Thu, 21 Jun 2007 16:14:01 -0700, b11_
| put finger to keyboard and composed:
|
| Can a standard floppy drive read a 2DD disk?
|
| There should be no problem. The 720KB diskettes are usually formatted
| with 9 sectors/track, whereas the 1.44MB diskettes have 18
| sectors/track. Both have 80 tracks. One requires a greater write
| current than the other, and this is indicated by the second hole in
| the jacket (people used to try for 1.44MB from a 720KB diskette by
| covering up this hole).

I think you meant to say "by drilling a hole" as the 1.44 has two verses
the 720 which has one.

|
| The problem with disc compatibility arises in old 360KB 5.25"
| diskettes when used in both 360KB (40 track) and 1.2MB (80 track)
| drives. This is due to the latter's narrower track widths, which means
| that a 1.2MB drive cannot completely erase the wider tracks written by
| a 360KB drive.
|
| - Franc Zabkar
| --
| Please remove one 'i' from my address when replying by email.

--
MEB
http://peoplescounsel.orgfree.com
________

I tryed repeatedly but can not format the disk.
__________________________________________________ ______________
"John Dulak" wrote:

b11_ wrote:
Can a standard floppy drive read a 2DD disk?

B11:

Yes IF the disk was created on a PC. NO if it was created on an older
Apple computer.

http://en.wikipedia.org/wiki/Floppy_disk#Compatibility

Note: there may be software utilities to allow a PC to read/write to
an Apple floppy.

HTH & GL

John

--
\\\||///
------------------o000----(o)(o)----000o----------------
----------------------------()--------------------------
'' Madness takes its toll - Please have exact change. ''

John Dulak - Gnomeway Services - http://tinyurl.com/2qs6o6

You asked can the drive read a "2DD" but now you say it won't format. Did
you choose 720K in the format dialog?


"b11_" wrote in message
...
I tryed repeatedly but can not format the disk.
__________________________________________________ ______________
"John Dulak" wrote:

b11_ wrote:
Can a standard floppy drive read a 2DD disk?

B11:

Yes IF the disk was created on a PC. NO if it was created on an older
Apple computer.

http://en.wikipedia.org/wiki/Floppy_disk#Compatibility

Note: there may be software utilities to allow a PC to read/write to
an Apple floppy.

HTH & GL

John

--
\\\||///
------------------o000----(o)(o)----000o----------------
----------------------------()--------------------------
'' Madness takes its toll - Please have exact change. ''

John Dulak - Gnomeway Services - http://tinyurl.com/2qs6o6

On Sun, 24 Jun 2007 12:11:00 -0700, b11_
put finger to keyboard and composed:

I tryed repeatedly but can not format the disk.

If you are trying to format from a DOS prompt, then type ...

format a: /f:720

.... or ...

format /?

.... for more options.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

On Sun, 24 Jun 2007 13:10:46 -0400, "MEB" meb@not
put finger to keyboard and composed:



"Franc Zabkar" wrote in message
.. .
| On Thu, 21 Jun 2007 16:14:01 -0700, b11_
| put finger to keyboard and composed:
|
| Can a standard floppy drive read a 2DD disk?
|
| There should be no problem. The 720KB diskettes are usually formatted
| with 9 sectors/track, whereas the 1.44MB diskettes have 18
| sectors/track. Both have 80 tracks. One requires a greater write
| current than the other, and this is indicated by the second hole in
| the jacket (people used to try for 1.44MB from a 720KB diskette by
| covering up this hole).

I think you meant to say "by drilling a hole" as the 1.44 has two verses
the 720 which has one.

Yes, sorry. smacks forehead

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.