>>>READER-TO-READER QUESTIONS AND ANSWERS
500 MHz) and would like to add
a larger hard drive (250 GB @ ATA133
or a 200 GB @ ATA100). I have been
told by some that the computer won't
be able to access the new drive's
entire capacity and won't be supported by the micro-ATX motherboard
(GT440ZX). Presently, its 'primary' hard
drive is a 27. 2 GB U-DMA ATA- 66
which is now full (OS=WIN98SE). I
would like to copy all the files on it and
replace it with the larger drive.
If I install the 250 GB, will I be able
to access the entire capacity and
will it be supported by my existing
motherboard or will I have problems?
Also, I need a recommendation for
software which will allow me to copy
("mirror") and move all my files from
one drive to the other.
Hard drive size accessibility is
dependent primarily on the operating
system (OS). You need to be running
Windows 2000 SP4 or Windows XP
with at least SP1 to access the full size
of the hard drive. In some cases, you
should also use the latest BIOS for the
motherboard you have.
You need BIOS A04 to access the
With BIOS A03, you are limited to
a 32 GB drive size.
You can get BIOS version
A04 from: www.bcmcom.com/tech/
As to moving your OS and
programs to a new hard drive, all
the major drive makers have a utility
program you can download for free to
migrate over to the new drive.
[#4076 - April 2007]
Can anyone recommend a decent
electronics glossary of terms or
#1 I have a 1970 edition of Modern
Dictionary of Electronics by Rudolf F.
Graf, published by Howard W. Sams.
It cost $7.95 when I bought it, but it is
still in print at 10 times the price, and
it is an excellent dictionary. I also have
Glossary of Communications by
Emerson G. Smith, published by
Telephony Publishing, Inc. It has words
that are not in the dictionary; it is
probably out of print but you may find
one on eBay.
#2 Why not use the 'Electronic
Encyclopedia' option found on the
John F. Mastromoro
Saint Johnsville, NY
#3 Probably the best dictionary of
electronics and communications
terms is the Wiley Electrical and
Electronics Engineering Dictionary that
was last published in 2004. This
dictionary contains in excess of
35,000 terms and will surely provide
answers and definitions to more terms
than we may think about.
The drawback is that this knowledge comes with a price and it can be
[#5074 - May 2007]
I have two lead-acid batteries, never used but two
years old that won't take a charge. I'm sure that they
became sulfated from sitting in a no charge condition.
Is there a circuit I can construct to desulfate them?
#1 Check Nuts & Volts classified, p. 97, May 07,
www.wizbangplus.com, it might work. Also, Google
desulfators. If they are sealed type "gel cells,"
Scott City, KS
#2 Alastair Couper designed a desulfator circuit
which was presented in Home Power #77. That
circuit appears here, with two additions: D2, a 15V 1W
zener; and C5, a .01 µF cap. Some of the original parts
specified have been changed to higher power
units: the inductors are Mouser part #542-2316-V for
L1 and 542-2324-V for L2; the fast recover diode, D1,
is a BYT08P.
In use, the desulfator should be connected to the
battery with short, #12 or larger leads. A transistor radio
placed next to the circuit will pick up noise and let you
know that it is pulsing.
Battery Desulfator Errata
In my battery desulfator article on page 84 of HP #77,
the value for C2 should have been 0.0022 µF, not
0.022 µF. My mistake.
I have put up a web page that will give more details to
help you build and use the desulfator circuit. I will place
updates there, and will add a guestbook soon to allow
comments and questions to be posted. I encourage a
group effort in this, since I don’t have all the answers.
August 2007 101