From owner-freebsd-questions Tue Apr 11 14: 1:44 2000 Delivered-To: freebsd-questions@freebsd.org Received: from hermes.avantgo.com (ws1.avantgo.com [207.214.200.194]) by hub.freebsd.org (Postfix) with ESMTP id 7F15837B7C9 for ; Tue, 11 Apr 2000 14:01:42 -0700 (PDT) (envelope-from scott@avantgo.com) Received: from river.avantgo.com (river.avantgo.com [10.0.128.30]) by hermes.avantgo.com (Postfix) with ESMTP id 11D2C26; Tue, 11 Apr 2000 14:01:42 -0700 (PDT) Received: (from scott@localhost) by river.avantgo.com (8.9.3/8.9.3) id OAA04771; Tue, 11 Apr 2000 14:01:43 -0700 Date: Tue, 11 Apr 2000 14:01:42 -0700 From: Scott Hess To: Augusto Bott Cc: freebsd-questions@FreeBSD.ORG Subject: Re: JFS, tcp ports, file systems... Message-ID: <20000411140142.A4731@avantgo.com> References: <20000411193318.1AFB1BC66@zipmx11.zipmail.com.br> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0pre3us In-Reply-To: <20000411193318.1AFB1BC66@zipmx11.zipmail.com.br> Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Tue, Apr 11, 2000 at 04:33:18PM -0300, Augusto Bott wrote: > 2 - I'm tweaking a portscanner, what's the highest port number > which a daemon/program/computer cas listen/send info? Ports are 16-bit unsigned integers. > 3 - On Hard disks, the Zero (0) track is in the center(or not)? Read > from the inner cylinders is faster than the outter cyl's? Usually on the outside. Data is recorded at a more-or-less constant density, while the disk spins at a constant RPM, so you can read data faster from the outer tracks than the inner tracks. Putting the 0 sector on the outside thus makes DOS and Windows (and anything else using FAT) seem faster. > 4 - For FFS/UFS, this is the place where the root dir's are written > (in the beggining of the partition/slice? If not, where is this > information written ? > (I 've heard that on OS/2 the root of any filesystem is in the > middle of the partition, thus lowering seek times...) I'm not sure it makes a difference - after the first filesystem access, the root directory will be in cache, and since it's the root, it will likely never leave the cache. Maybe OS/2 stores all directory info in the center of the partition? FFS distributes files (and directories are files) all over the place. Later, scott To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message