Creating BIOMAP CDROMs - Instructions & Procedures

The procedure for creating CDROMs for the BIOMAP acoustic data is straightforward, involving transfering the data from the source (diskettes, hard disk or Bernoulli drive) to the CDROM writer's PC remote hard disk, creating a logical then physical image of the data to be transfered on the local hard disk, and finally copying the physical image to one for more CDROMs. The instructions below describe these steps in detail.

Transfer Data to CDROM PC

In the example used here, the original 120 kHz and 420 kHz acoustic and ESS (environmental ship sensor) data are stored on a standalone PC on its hard drive, running DOS. In order to make these data available to the CDROM PC, the data were first transfered, via the network, to a Sun workstation. This process took about two hours. The data files were copied into separate directories on the Sun to a drive know as "g:" to the PC as follows:

Software Preparations

The DOS-based CDROM transfer software is located in the \gear directory. With a standard editor, edit the gear.ini file to reflect the current date, the CDROM title, customer name (i.e. WHOI), and confirm that the CDROM will use the [ISO 9660] standard.

For the MSGEN (Multi Session Generation Program) to work,

Program Operation

To start the program, enter \gear\msgen. The program prompt is CD>. Although it is possible to generate the CDROM directly during the construction of the logical file, the procedure described here first creates the logical image, then the physical image. The physical file is then copied to the CDROM.

Create New Volume

Enter the command newvol biomap 74 where biomap is the name of the CDROM volume and 74 refers to the size or length of the CDROM, in this case, 74 minutes. The program responds confirming the creation of this volume and says that Track 1 is created.

Copy Data to Logical Image

During the creation of the logical image, the program confirms the existence of all specified files, checks the file sizes, and effectively creates a directory structure for the files that will go onto the CDROM. This step only takes a few minutes since the data are not read at this time, only the file attributes are checked.

There are several ways to copy the data to the logical image, this procedure only shows one of the ways. For more information consult the program documentation.

First, create the directories in the logical image as follows:

Next,"copy" the data files using the copytree command to the correct subdirectory as follows:

Create Physical Image

To create the physical image or volume (note: this file is stored on CDROM PC's hard disk; it is not output to the CDROM yet) issue the command physvol. This step took about an hour for approximately 400 Mbytes of data, accessed over the network.

Setup Command

The SETUP command establishes certain perameters of the output to CDROM operation such as

Writing CDROM

To actually place the physical image onto the CDROM issue the write biomap command, where biomap is the name of the volume. This step takes about 15 minutes for 400 megabytes writing at 4x speed. Note that the CDROM must be placed in a jacket in this writing unit. To create a second copy of the CDROM, remove the first CDROM and reissue the command.

Creating subsequent CDROMs

In this case, a second CDROM was needed to store the 420 kHz data. The procedure is similar to the above as follows:
Created: Tuesday, August 08, 1995, 8:28:19 AM Last Updated: Tuesday, August 08, 1995, 8:28:19 AM