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SCSIInfo V1.1
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SCSIInfo readme
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1991-08-31
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SCSIInfo V1.1 by Bob Easterday
SCSIInfo is a Control Panel document which provides a comprehensive table
of information about each SCSI device attatched to your computer.
SCSIInfo works consistantly with System Software versions 6.03 - 7.0.0.
In addition to the standard Reset, Scan, and Mount functions, SCSI info provides
technical information which can be used to diagnose various problems you may be
having with your hard disks. Pay particular attention to the descriptions below of
each data field.
Vendor: Who made it?
This is the vendor of the mechanism itself. In the case of external drives, this name
will usually be different than the vendor who sold the main unit.
Model: What did they call it?
In the case of Hard Disks, the model name will generaaly reflect the unformatted
capacity of the drive. For example the P80S is Quantum's model name for one of
their 80 Megabyte hard disks.
Version: What is the firmware version?
This is the version of the software in ROM on the drive in question. The firmware
contains code which among other things, determines which portions of the SCSI
protocol are implemented for this drive.
SCSI ID: This is the SCSI address of the device this information pertains to.
Sectors: Total number of sectors for the entire device.
Capacity: How many Kbytes of information this device can store.
Cylinders: How many data cylinders does this device contain?
Free Space: Total unused space on this device in Kbytes.
Note that in some cases value indicates only the free space of the 1st partition.
Initialized: When this device was last initialized.
Backed up: When this device was last backed up.
This value will say "Never!!" if you have not backed up since the disk was
initialized. Also note that some backup programs do not properly set the
backup flag in the Volume Information Block.
In this case, SCSIInfo will report "Never!!".
Interleave: The interleave under which this device was formatted.
Some buffered drives will report an interleave ratio of 0:1. These drives
use an adaptive interleave which optimizes throughput for the particular
computer to which it is attached.
Bytes/Sector: This will generally read 512 under the Macintosh operating system.
Heads: The number of read/write heads this device uses.
Boot Version: Apple's version of the Boot Blocks currently installed on this disk.
'0' indicates this to be a non-bootable disk. This information is
irrespective of any System software which may be installed. If you
have a disk which contains a System Folder, but has a Boot Version of
'0', you will still be unable to boot from that disk. Conversly a disk
with valid Boot Blocks will not boot if there is no System Folder
installed.
As you may have guessed, the boot version IS specific to
the System version. Thus you should ALWAYS use Apple's Installer
to install System software. NEVER copy a System Folder. The Installer
automatically writes the appropriate Boot Blocks at install time.
Factory Defects: This is a list of how many bad blocks were locked out during the
Original factory format. These bad blocks are due to imperfections
in the surface of the disk and data will never be written to them.
User Defects: This is the number of bad blocks encountered on subsequent formats.
These defects are largely due to the drive geometry
changing as the drive ages. As with Factory Defects, these blocks
have been locked out from use, and data will not be written to them.
System Version: This is the System version under which you are currently operating.
This field does NOT report a Sytem Version which may be installed on the drive
under test.
Drive Icon: The SCSIInfo Icon will change to the drive's icon when a device is
selected.
Drive Name: Right after the Icon, The name of the 1st volume at the current
selected SCSI address will be displayed.
In addition to the standard table of information, there is a message area located
just above the Scan button. Errors will be reported here as well as other useful bits
of information as appropriate.
The Buttons:
0 - 6 represent the SCSI addresses. The buttons which are highlighted indicate
at which addresses a device was located. Pressing on a located device will display
the table of information as described above.
Scan will search the SCSI bus for devices and set buttons 0-6 as appropriated.
This is useful if a device has come online after you have run SCSIInfo.
Mount will place the icon on the Desktop for all volumes found on the ALL devices.
Note, that this process will bypass many password protection schemes,
used by some partitioning software. So Use With Care!
Reset will reset the SCSI bus, in case there is an arbitration problem.
The fine-print:
SCSIInfo represents many hours of hard work. It is being released as shareware.
If you find it useful, please send what you feel is appropriate to the utility it
provides.
Bob Easterday
522 Loumena Ln.
San Jose, Ca.
95111