🚀 go-pugleaf

Jouke Numan (jnuman@hiscom.nl) wrote:
: David Longley wrote:
: > 
: > I have just substituted a Barracuda ST15150ND for the 2.1GB barracuda
: > I had running off the AHA2940 I had in my machine. After a brief flash
: > of the drive's green LED and the sound of the disk starting, it seems
: > to go no further. The AHA2940 does not see the drive.
: > 
: > Supposedly a new drive.......anyone with any helpful suggestions?
: > 
: > I have a nasty feeling about the ND!! Is this a "differential" rather than
: > "narrow"? IF so, what can I do about it?
: > --
: > David Longley

: Yes, the N stands for SCSI (not narrow) the D stands for differential. You
: cannot connect a differential device to a single-ended controller as the
: electrical signals are quite different. You must either get a single ended
: Barracuda (type ST15150N) or a differential controller (I'm not sure if
: Adaptec has them, look at their WWW site). I don't know your specific needs,
: but unless you have to have differential for the extra cable-length, you
: should stick to single-ended. It's much easier to get hold on and cheaper
: as well.

: The typenumbering scheme of SEAGATE is as follows:


:   +----- Seagate              +----------- PR = Paired Solution. Drive shipped
:   |   +- Technology           |            with menu driven installation soft-
: +---+---+---+---+---+---+---+----+---+---+ ware. Seagate controller or host
: | S | T | 1 | 4 | 8 | 0 | A | PR | - | X | adapter included with disc drive.
: +---+---+---+---+---+---+---+----+---+---+
:           |   |   |   |   |        |   |
:           |   +---+---+   +--------+   +-- Access Time 0 = Standard/1 = Faster
:           |       |                |
:  +--------+       +----------+     +----------------+
:  FORM FACTOR                 MBytes                 INTERFACE
: +---------------------------+----------------------+-------------------------+
: |1xxx = 3.5"                |Unformatted (approx.) |Unspecified = ST412/MFM  |
: |     half-height (41 mm)   |e.g. ST225 is 25      |N  = SCSI                |
: |2xxx = 5.25"               |unformatted MBytes    |R  = ST412/RLL           |
: |     half-height (41 mm)   +----------------------+A  = AT Bus (IDE)        |
: |3xxx = 3.5"                |                      |X  = XT Bus (IDE)        |
: |     1-inch high (25 mm)   |                      |E  = ESDI                |
: |4xxx = 5.25"               |                      |J  = SMD/SME-E           |
: |     full-height (82 mm)   |                      |K  = IPI-2               |
: |6xxx = 9-inch              |                      |ND = Differential SCSI   |
: |8xxx = 8-inch              |                      |NM = Mac Compat. SCSI    |
: |9xxx = 2.5"                |                      |S  = Synchronized Spindle|
: |     .75-inch high (19 mm) |                      |V  = NetWare Ready       |
: +---------------------------+                      |P  = Write Pre-Comp      |


: -- 
: +------------------------------------------------------+
: | Signature of: Jouke Numan  <jnuman@hiscom.nl>        |
: | HISCOM bv, department of Systems Development         |
: | Schipholweg 97, 2316 AX  Leiden, the Netherlands     |
: | +31-71-5256757 (office) +31-71-5216675 (FAX)         |
: +------------------------------------------------------+

--
Jay Huldeen
jay@usa.net