1 Dec
2014
1 Dec
'14
5:49 p.m.
Does anybody know if it is normal for a TM-848E to spin up for a few seconds
after getting power and then stop spinning. The only other 8" drives I have
experience with seem to start spinning when power is applied and keep
spinning regardless of if the door is latched or if there is a disk in
there. Thanks.
1 Dec
1 Dec
6:15 p.m.
On 12/01/2014 02:49 PM, Ali wrote:
Does anybody know if it is normal for a TM-848E to
spin up for a few seconds
after getting power and then stop spinning. The only other 8" drives I have
experience with seem to start spinning when power is applied and keep
spinning regardless of if the door is latched or if there is a disk in
there. Thanks.
The 848 has a DC motor--most full-height drives have an AC line-powered
motor, so they spin all the time.
My guess is that it's probably normal, since there's also a circuit in
the 848 to detect when a disk is inserted and turns on the motor to
correctly seat the floppy.
--Chuck
6:29 p.m.
It's been several weeks since I've done anything with my TM-848E drives, but I
think that the behavior that Ali described is normal. As I recall, I have older
belt-driven (but still DC-powered) TM-848 drives in some of my Radio Shack machines, and
the newer ones with brushless hub motors that I use in my imaging setup. Both of them stop
the spindle motor when not in use, unlike older 8" drives with AC-powered motors that
run continuously.
--
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/
2 Dec
2 Dec
1:03 a.m.
The 848 has a DC motor--most full-height drives have
an AC line-powered
motor, so they spin all the time.
Thanks Chuck just making sure as my only other 8" drive (Qumes) are on all
the time.
As I recall, I have older belt-driven (but still
DC-powered) TM-848 drives
in some of my Radio Shack >machines, and the newer ones
with brushless hub
motors that I use in my imaging setup. Both of them >stop the spindle motor
when not in use, unlike older 8" drives with AC-powered motors that run
continuously.
Mark,
Do you know, or have any experience, with reliability of the brushless vs.
belt driven? My bet would be on the brushless motor (the belt being the weak
point) but you never know.
-Ali
2:40 p.m.
On Dec 1, 2014, at 22:03 , Ali <cctalk at
fahimi.net> wrote:
Mark,
Do you know, or have any experience, with reliability of the brushless vs.
belt driven? My bet would be on the brushless motor (the belt being the weak
point) but you never know.
I haven't been in the retrocomputing game long enough to get a feel for that yet, and
8" drives were already on the way out when I started getting original experience back
in the day. My gut feeling is that the direct drives ought to have more reliable spindle
drive systems and less RPM flutter. There are also other considerations, though; for
example, on the TM848, it's not as easy to get access to the heads for Q-tip cleaning
as it is on some of the older, bulkier drives, so an older drive might be more practical
for imaging lots of questionable old disks that are likely to shed oxide.
--
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/
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