doubt on dd command output

[Lakshmipathi]

Hi,
i tried a dd if=file1 of=file2
it copies the file1 to file2
and displays output like,
"
1+1 records in
1+1 records out
"
what's this mean?
Thx

[devils casper]

1+1 records in
1+1 records out

for dd command, 1 unit = 512 bytes.

1+1 means filesize of file1 is greater than 512 byte and less than 1024. copy a file having size around 2048 bytes. output will be:

4+1 records in
4+1 records out.

512 * 4 = 2048.

[Lakshmipathi]

Thanks casper