Removing arch1*.dbf files to save disk space

Hello folks,
arch1*.dbf files are archive redo log files? They are filling up my harddisk. Are they safe to remove? How can I stop archiving?

In the pfile, as I have said in my earlier post, these lines are commented out:
# Uncommenting the lines below will cause automatic archiving if archiving has
# been enabled using ALTER DATABASE ARCHIVELOG.
# log_archive_start = true
# log_archive_dest_1 = "location=/opt/app/oracle/admin/cdr/arch"
# log_archive_format = arch_%t_%s.arc
That's why I cannot understand what's happening. However in the alert file I am having these logs:
cdr; ARC1: Creating local archive destination LOG_ARCHIVE_DEST_1: '/opt/app/oracle/product/10.1.0/dbs/arch1_62443_509796482.dbf' (th
read 1 sequence 62443)
ARCH: Connecting to console port...
Thu May 6 09:35:33 2004
cdr; ARC1: Closing local archive destination LOG_ARCHIVE_DEST_1: '/opt/app/oracle/product/10.1.0/dbs/arch1_62443_509796482.dbf'
ARCH: Connecting to console port...
Committing creation of archivelog '/opt/app/oracle/product/10.1.0/dbs/arch1_62443_509796482.dbf'
etc..
Of course when I had no disk space I was having these errors:
ARCH: Connecting to console port...
Mon May 17 09:07:07 2004
Errors in file /opt/app/oracle/admin/cdr/bdump/cdr_arc0_582.trc:
ORA-19502: write error on file "/opt/app/oracle/product/10.1.0/dbs/arch1_63596_509796482.dbf", blockno 18433 (blocksize=512)
ORA-27063: number of bytes read/written is incorrect
SVR4 Error: 28: No space left on device

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    <...>
    Now I come to find that Aperture wants to copy all
    the photos I have it index (ideally all of them) into
    a single library file. Is this correct? Is there
    any way to prevent it from doing this and just
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