Questions tagged [hard-drive]

Anything related to hard disk drives (HDDs), a.k.a. hard-disks or hard-drives (HDs), i.e. electromechanical devices often found inside computers used as secondary storage (mass-storage). They can store information in digital form by magnetizing tiny areas of magnetic material with which the their internal disk-shaped rotating platters are coated.

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60 views

Hard disk erase data

How do hard disk erase data?As far as I know, the hard disk stores data like this: The write head contains a coil of wire with a core of iron.When current passes through, depending on the direction ...
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Where does a wire labeled “3G” must be connected in turbo x notebook? [closed]

I got angry and punched my Turbo x notebook and it shutted down. When I opened it again I got the famous error 0xc00000e9. So I thought that possibly a cable is disconnected or the hard drive is ...
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mysterious hard drive deaths, can a very humid environment shorten lifespans significantly [closed]

I have somewhat of a mystery on my hands: In the last couple years, I had several external hard drives die suddenly. Unit 1 was from the US, powered through an external supply, worked fine for ...
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49 views

difference between a 5 v 1a and 5v 0.65a hd [closed]

What's the difference in the ampere of a 5v. 1A laptop hard disk and 5VDC 0.65A 12VDC :0.50 A PC hard disk for my laptop.
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Driving a 4-wire Hard Drive Motor

After reading many contradictory accounts of the "proper" method, I would like to clear it up: what is the correct method for driving a 4-wire, star configuration hard drive motor? What I have ...
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1answer
44 views

What is the difference in working of an GMR readhead vs an EMR one?

As I understand it, a GMR readhead works by stacking magnetic and non magnetic layers, passing a current through them and measuring the total resistance. Then a 4 point measurement is used to remove ...
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0answers
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Help identifying IC damaged by wrong voltage

I accidentally fried an IC when switching out a power supply; sent 12V instead of 5V. I've been trying to find some information on this drive, a Corsair M500 240GB, (CT240M500SSD1) - maybe a datasheet,...
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1answer
164 views

Hard drive won't power on, is this the reason why? [closed]

I have a somewhat old, but functional (used to be, actually) hard drive, model Samsung HD103SJ, which I use for backup purposes. This means this is not a fixed unit. Since a few weeks ago when I ...
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1answer
187 views

Why does reading 1 byte from hard disk has the same speed as operation reading 1000 bytes?

Two operations: read 1 byte from disk read 1000 bytes from disk Why exactly will they have approximately the same speed?
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1answer
722 views

Is mechanically switching SATA drive signals possible?

Since SATA has made it possible to do all data interfacing to a drive through 4 wires, what I'd like to do is physically route two SATA ports to two drives, through a switch that simply swaps them. ...
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Using HDD as an input device for Arduino

I'm wondering if is it possible to use an old HDD as an input device that would feed some kind of data to Arduino. If you manually positioned the head and platter (the disk is not spinning, so it ...
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1answer
580 views

does heat kill hard drives? hhd lifespan due to heat [closed]

These days it's hard to buy an external 3.5" hard drive with a fan inside or well heat dissipation design. I have 4 of such hard drives, and two have already failed in first few months. Here is the ...
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Why are hard drives not limited to sizes of a power of 2?

For example, hard drives can be 320GB (between 2^8=256 and 2^9=512) in size, whereas memory appears to be limited to sizes of power of 2.
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Can photos be printed on the actual disks in magnetic hard drive the same way they are put on CDs [closed]

I've been reading about the Event Horizon Telescope and found the Computer World article Massive telescope array aims for black hole, gets gusher of data. In it they describe what must be the world's ...
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How do hotswapping computer parts work?

Computers support hotswapping so that a user can replace a harddrive while the system is running. Is that mostly software just powering off the harddrive or is it some special hardware involved? If ...
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1answer
532 views

Are Hard Drive Motors Stepper Motors? [closed]

Can a hard drive motor been controlled by a stepper motor? Like the one shown below? Thanks!
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3answers
812 views

Raspberry pi with two USB 2.5 inch Hard drives and powering them in parallel via one 5V PSU [closed]

I'm a hobbyist/tinkerer and want to make sure I don't fry my equipment by doing it wrong. I'm trying to connect two/three 2.5 in USB HDD's to a Raspberry Pi 3. The power supply I have is 5V 2.5A and ...
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5k views

Can hard drive stepper motor can be used for making drones? [closed]

I have some useful hard drive stepper motor can it be used for making drone??
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1answer
882 views

Does manufacturing different sized hard drives cost the same amount? [closed]

Is there a major difference in the cost of manufacturing, say for example, a 1 TB hard drive as compared to a 250 GB hard drive? Is it the same when hard drives get even as big as 8 TB? If no, then ...
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1answer
525 views

Is it possible to read erased flash memory?

In hard disks, a "quick format" does nothing to the actual data on the disk - just clears the FAT (file allocation table), which then appears as a "blank disk" to the user. Therefore, it is fairly ...
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1answer
73 views

HDDs after format [closed]

What happen to our hard disks after formatting the partition with quick format option, from the electronics view? Is it possible to recover formatted data, are software solutions good enough to ...
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1answer
1k views

How to get my internal Harddrive to spin externally?

I have a Seagate ST3500620AS Harddrive that's just laying around and not being used. I want to power the motor at full speed (rated to run at 7200rpm) and do some hobby projects with it. Problem is, ...
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1answer
456 views

RPM v read/write speed

I am a developer using languages like C++ and .NET. I am trying to understand how computers work at a lower level. Say I have a hard disk that is 7400RPM and 150MB read/write speed. My book implies ...
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1answer
90 views

Bit persistence on a Hard Disk Drive

I was wondering if there was a time limit to the "persistence" of bits on a hard drive, a classical SATA for example. If I'm correct, bits are written by a magnetizing head in some cells on the hard ...
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1answer
117 views

Addressing the cylinders of a Hard Drive

I want to address the cylinders of a Hard Drive but I can't find a good manual of the pinout of the IDE interface. Anyone knows how to do that? I don't want to read/write anything in the disk, just ...
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2answers
271 views

What natural processes can cause Catastrophic Failure of a Hard Drive?

My understanding of conventional hard drives is they fail slowly. Something breaks and skips along the platters and data begins to be corrupted. I believe this is what the mean-time-between-failures ...
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1answer
391 views

Can I run this hard drive on 12Vdc 1.25A instead of 1.5? [duplicate]

I have a My Book Essential external hard-drive from WD that ships with a 12Vdc 1.5A 18 Watt adapter. Will I be risking everything by plugging it into a 12Vdc 1.25A adapter?
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2answers
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usb drive EEPROM IC how is memory read-only blocked and unblocked?

I notice ofteen free give-away usb thumb drive come with a certain memory space locked and unwritable so that a 4 GB flash drive for instance has 1GB of advert which cannot be format. Given that thumb ...
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2answers
375 views

Effects of a subwoofer on computer components [closed]

Ok so here's a question that I've only seen asked once, what are (if any) the adverse effects of having a subwoofer included in a PC case mod? The Backstory: I've got an OK case. Looks nice, has cool ...
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1answer
655 views

What is the hardware/device that can switch a 5V and 12V (simultaneously) PC power supply lines?

What I want to do is to switch the power supply lines (5V and 12V) for a hard drive. The 5V line is meant for data transmission, and the 12V is for the spinning disk DC motor. I would like to control ...
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1answer
297 views

What is the maximum magnetic flux density a HDD can tolerate before data is corrupted?

Does anyone have hard numbers explaining the maximum number of Teslas a hard disk drive can tolerate before data will be corrupted. This forum says "a lot", which isn't super helpful. This one ...
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4answers
51k views

How can I spin an old HDD motor?

I've stripped out an old IDE (40 Pin) HDD from 1998 for use in a POV display project (Gr. 12 Computer Engineering), and I've been trying to spin it up. The problem is that the HDD motor is brushless ...
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3answers
341 views

Using a CPU manually [closed]

Ok, I know this may sound dumb but, here is the thing: I recently removed a cpu, ram and hard disk from my 10-ish year old pc. At first, I did that to understand how the pc was built. Now, the next ...
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2answers
4k views

What is the function of a Logic board on a Hard disk? [closed]

Since I am planning to troubleshoot my failed hard disk which is not powering up, I am planning to check whether the logic board is working fine or not. Shall be grateful to someone who can tell ...
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2answers
814 views

Reliable secondary storage for Raspberry Pi (or other such single-board computers (SBCs))?

Most SD cards have a fairly limited life (as in maximum number of read-write cycles), and in spite of wear-levelling, for relatively frequent disk update applications, would probably fail in a year or ...
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6answers
273 views

Hard drive that has the ability to “read” old data while it performs a write?

Is there a hard drive (protocol command, specific model, etc.) that, while writing new data over old data, it "read"/return the old data back to the controller/OS? (Analogous to a simultaneous read-...
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6answers
5k views

Can I safely use a HDD in a car?

A few months ago I bought some new speakers and an amp for my Jeep. I made a little face plate with an ALPS potentiometer to control the volume and it has an iPod dock (no head unit, just the pot). ...
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3answers
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Over-volting an hard disk voice coil actuator

I have disassembled an old hard disk and I making the voice coil move by applying a voltage between the terminals of the coil. I plan to use this to raise or lower a flag attached to the actuator arm. ...
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5answers
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How big a magnet do I need to wipe my portable HDD?

According to this article, I need a really big magnet to wipe the data off my HDD. Thing is, I don't know how strong a "laboratory degausser" is, so I'll ask it in my own terms: I have a pair of ...
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529 views

How is the state of a bit position on a hard drive measured?

Firstly, I am not the EE type, but I do have a petty good foundation on physics work on a pretty low level. I was wondering what mechanism it is that measures the magnetic indentation on hard drive ...
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2answers
2k views

Where can I find XT-IDE (8bit IDE, XTA) specifications?

I have an old hard drive and would like to try to read the data from it. The hard drive is IDE, but it is the old version of IDE, called XTA and it is only 8 bits wide (compared to "normal", 16bit IDE)...
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14k views

hard drive head/seek motor with Arduino?

I can see there are many writings on line for using an Arduino to control a 4 or 6 wire stepper motor, that spins the platter in side an IDE hard drive. I want to control the seek read/write head ...
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What exactly are 'pins'?

I actually ran into this question just a few moments ago: https://serverfault.com/questions/12025/intro-to-laptop-hard-drives The first answer is the one that caught my attention. Apparently, there ...
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1answer
2k views

How can I measure TVS diode for Seagate Momentus 7200.3?

I hope the TVS diode (or something like this) of my HDD's PCB is gone, so I could fix this HDD easily, but I don't know where it is. Can you tell me how to measure it? I read this but I didn't ...
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1answer
2k views

Controlling/Reading Hard Drive Brushless Motor w/ uC

I am working on creating a Hard Drive DJ similar to the other posting on this website, except that I want to drive the motor when the user isn't scratching on it. Multiple sources recommended using an ...