Drive Definition and 528 Threads

I am having trouble with my DVD-R drive. The computer is one year old. In the beginning all was well - and then I bought new CD-R discs which the burner rejected continuously. Assuming it might be that it just didn't like the discs, I didn't let it bother me and ignored it. Today I bought...

Stress Calculation on "D" Drive Shaft Hey guys, I have a problem. I need to calculate the stress on on a shaft that's driving a fan. The shaft setup is pretty simple. It's a basic circular shaft, then one side is milled to a flat, slightly resembling the letter D. So, of course I have the...

We have often heard that, statistically speaking, it is safer to fly commercial airlines than to drive. How would one measure this? How is it measured actually and is it meaningful? And if anyone has link to the actual numbers, that would be great. This is my stab at it. Pick a sample...

Homework Statement A computer is reading data from a rotating CD-ROM. At a point that is 0.030 m from the center of the disc, the centripetal acceleration is 120 m/s2. What is the centripetal acceleration at a point that is 0.050 m from the center of the disc? Homework Equations ac =...

I am involved in a legal case and I need to know some things about flash drives. 1. Does anyone know if it is possible to find out for sure exactly when a file was saved onto a flash drive? I know that you can acess the "Date Created" and "Date Modified" information through by right...

A baseball is hit deep to center field. The vertical position from home plate of the ball with respect to time is described by: v(t) = -20t2 + 103.5t +5 in feet above home plate The horizontal distance from home plate is described by: h(t) = 84.32t in feet where t is in seconds HINT: The...

I got this in my school FYI email: I think my engine and transmission oil needs more time than that to heat up and work properly. Also, suddenly driving off with a cold engine block is a good way to develop cracks in the cylinder walls - which is why you don't just pull the throttle all the...

I can give the following description to the problem, but I don't specifically know what should be done to drive an actuator (specially a piezoeelctric one) in its resonance frequency using a feedback. **The sensor consists of a piezoelectric transducer and a vibration pickup. When an...

I am using a gear mechanism in one of the toys that i am making for my baby. but the gear makes a lot of noise. Will replacing it with Roller drive or friction drive reduce the noise? Is there any other way to reduce noise from gear drive?

I love Star trek and I was thinking, how to create a warp drive. I have read a discusion about EM waves on this forum, there was written that they do not need any medium for propagation and : “In a simplified sense the oscillating E field sustains the oscillating B field which sustains the...

Dear all, I need clarification regarding torque requirement in the following arrangement. Imagine a shaft 25mm diameter 600mm length simply supported and one end. Gear is attached to drive the shaft. Load is externally applied via lever arm and different material(polymer) same diameter...

I recently got the following message during booting; "Smart failure on Primary IDE Channel 3. Back-up your data, Disk drive failure may be imminent" I've dealt with this problem previously, only problem now is I have two HD drives. How do I know which one this concerns?

Preparing a 0g test for “space drive” that apparently conflicts with law conservation Plans of testing a working model in a 0g environment are being considered for the first semester of 2009 (Zero Gravity Flights) we hope to demonstrate we have a practical working idea. I would be grateful if...

I have an external Western Digital 320gb hard drive that has never given me problems. However the only thing i can think of that has caused sudden problems for this external SATA drive is the bios flash that i recently updated. The drive is recognized in mycomputer, however it doesn't say how...

I am a member of a hard-science science-fiction group. Many authors in our group are striving to make a realistic science fiction scenario that is physically possible. At the moment we are discussing whether this ship drive idea is possible or not. But few among us are real physicist...

As I understand it, a beamed core antimatter drive would produce thrust by annihilating matter and antimatter and ejecting the results of the annihliation via a magnetic nozzle. The usable results would be charged pions, which would decay into muons, correct? So my question is, if a...

If a spaceship is traveling at 90% the speed of light on the X axis. And it is also traveling 90% the speed of light on the Y axis. What is its velocity?

Shawyer's "Electromagnetic Drive" Hi, I'm sure you've heard of this proposed concept by Robert Shawyer for an "electromagnetic drive" which is claimed to generate an unbalanced force inside of a resonant QED-cavity, thus causing acceleration that appears to violate Conservation of Momentum...

I stumbled across it on wikipedia. I'd never heard of it before but sounds quite interesting. I wonder if it'll ever be pursued as a way for faster than light travel. I think it's clever the way it allows this without defying the laws of relativity. What's everyone elses opinion?

Hello, I'm working on a project in which I need to design and build a home-made wind tunnel, and then publish instructions on building and using such a wind tunnel. My design is intended for middle school and high school student research, so it is simple yet as aerodynamically sound as I can...

Homework Statement I try to drive distance formula which is S=vt+1/2at^2. I use velocity and acceleration formula to drive the distance formula but i couldn't get the distance formula.is there anyone know how to drive S=vt+1/2at^2. and how that came from in the first place . thank...

Hi guys I need help with my pc I use for my projects and programming.It doesn't want to boot from the hard drive and really need it to because I have some very important information in it. I am not good with hardware(hope one day i will) but have tried everything I can to get it working...

Hello all. I have a dell inspiron 1525 laptop, and I've had it for about 4 months. I've been downloading music here and there, but nothing too major. Earlier this week I realized that my computer had used about 70gb of memory, and I had no idea where it was. So I downloaded a disk analyzer...

There are probably earlier threads about this, but I couldn't locate them quickly, so risking to be redundant with the question but .. .. my daughter bought herself a LaCie 500gig harddrive for unlimited movie looking. The gadget works fine with XP, but Vista ignores it completely. Any tips?

It's done me good service since 2002, but about three days ago, my desktop machine refused to boot. So I did some digging on the Microsoft help site, configured my BIOS to boot from CD, and stuck in my Windows XP disk to attempt to repair Windows. Attempted to start Recovery Console, but it...

Your opinion, please. Does one of the two variations of this circuit offer a clear advantage, or is it a wash (see attached)? This indicator circuit turns on the LED below 11V (set by the zener). The LED cathode must be at ground (it is actually part of a tri-color LED with a common cathode)...

Hi, today I tried to open a cd with my cd/dvd - rw drive and I got the error: "Access denied - incorrect function" I know it's not a hardware problem because I can read and write to dvd's and cd's that I burn with my computer - I only have a problem with cd's burned on a different computer...

I'm picking up an 8gb of 16gb flash drive. I'm planning on installing a linux distro on it, since I find myself using liveCDs so much anymore. Any suggestions? I've used puppy and DSL before, but since I'm not really limited spacewise I'd like to use something a little bit more...

I frequently Update file on my memory stick and (foolishly) forget to backup(!) could i script an auto run for when i plug my memory stick in it would sync. specific files. Please reply soon I need Help!

I have a HP iPaq 1900 that only has an SD card slot and an iPod hard drive with 20gb and ata 6. SD cards are too expensive and I want to make use of my hard drive. Is there a way you can think of that can connect the hard drive to the iPaq? I was thinking of buying an SD card...

I would like to boot off a usb drive on a pc that does not support it. Has anyone thought of booting off a cd and transferring the start-up to the usb drive?

hi everyone ...i stopped sharing in this amazing forum for long time because of i was so busy in my work >>> but i always come back when i need it . , and i hope you can help me . my problem now that i can not see the CD ROM icon when i open My Computer screen it is not found , and when i...

When searching through a catalog for gear drive reducers, I find that many of them list nominal output torque and nominal input speed. My question is what does the term 'nominal' in that context mean. If it lists nominal output torque of 3186in.lb, and nominal input speed of 2900rpm, does...

My bro has installed a slave drive on his windows box. He can see it in Device Manager, which can tell it's a 160Gb drive, and he's been able to format it too. (He's not switching drives, he's still got Windows running fine on his Master drive, he's simply adding a slave. ) He can't see it...

So my computer is just over 1 year old. I put it on sleep a lot rather than shutting it down (but I don't think this hurts the hard drive). Is there any reason for worry? According to HD Sentinel, the percent health is 88%. According to "Failure Trends in a Large Disk Drive Population", my hard...

1. The figure below shows the drive train of a bicycle that has wheels 67.3 cm in diameter and pedal cranks 17.5 cm long. The cyclist pedals at a steady angular rate of 76.5 rev/min. The chain engages with a front sprocket 15.2 cm in diameter and a rear sprocket 7.25 cm in diameter. 2. v...

My young men, that is. I need to rant. <begin_rant> I just cooked a fantastic meal, main course was red snapper cooked in wine topped with tomatoes, portabella mushrooms, shallots, and then topped with cheese. I used three pounds (three pounds!) of fish filets for four people. Any leftovers...

hi guys >> please help me if u can my problem is : when i try to open th C ( local disk ) drive .. the window ( open with )appears>>as the case when u try to open unknown program or software ... please if u can tell me what is the problem and what is the solution . thank u

I have absolutely no idea how to do this, but tell me if it will theoretically work: Somehow 'slice' the membrane around you into a little membrane bubble you float on, then move it around in Bulk space until you get to where you want to go, then rejoin it with the membrane to get back into...

Brakes on Drive Shaft ?? HI all, I am new to this forum. I have a doubt on braking system. Any help in this regard is highly appreciated. Why can not we have brake on drive shaft or some point at flywheel ?? Any discussion in this regard is appreciated. I am hoping to find a...

Lambda Warp Drive... Here's an interesting paper, http://arxiv.org/abs/0712.1649 It's about "locally manipulating lamdba" to get something similar to the Alcubierre warp "bubble". I love wild stuff like this...

Hey folks. If anyones interested in warp drives I've co-written a new paper. http://xxx.lanl.gov/PS_cache/arxiv/pdf/0712/0712.1649v2.pdf Its being published inthe Journal of the British Interplanetary Society early 08. Anyone else interested in warp drives/ wormholes etc?

I just got a call from this guy who whines and whines and whines. :rolleyes: He is a small oem that I did a job for about seven years ago. Back then he had bought twenty-year old equipment [industrial controllers] from an HP sale and then expected it to work like the new technology. Of course...

Homework Statement Wheel A of radius ra = 6.5 cm is coupled by belt B to wheel C of radius rc = 32.8 cm. Wheel A increases its angular speed from rest at time t = 0 s at a uniform rate of 6.2 rad/s2. At what time will wheel C reach a rotational speed of 108.3 rev/min, assuming the belt does...

Let's say you're running a Fortran program that writes to the hard drive. What happens when the hard drive is completely full? Do other files get written over?

Does anyone know if there is a way to password protect your thumb drive. Or any other kind of security that I could add to it.

Hi, Anyone knows how to have one bootable thumb drive with multiple programs? So that we can select the program needed to boot up (run). This can save the thumb drive too because some programs are not too big. I will appreacite for any help! Mike

So I use "date modified" as a sort of organizational tool - and would like to keep that. When my NTFS hard drive transfers files to a FAT32 hard drive, date modified attribute of folders is kept. However, I reformatted the FAT32 hard drive into another NTFS hard drive - and the date modified for...

Does anyone have a strong hard drive preference? I used to buy only Seagate drives, but I recently had a Seagate drive die and I'm thinking about going with another company this time. What do you guys think about Western Digital or Maxtor?

Hi, Could I use the following item: http://docs-europe.electrocomponents.com/webdocs/03c4/0900766b803c41c7.pdf" to drive a piezo crystal to produce ultrasound? I know it wouldn't be perfect but it might be good enough for a small underwater depth sensor. Any ideas if it's possible?