Repair information on hard drives or hard disks. Hard drives are magnetic data storage devices. They are used in most desktop, laptop, and server due to their low cost and high data density.

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2.5" and 3.5" jumper differences

Are there any differences between jumpers? Specifically, I need a jumper for a 2.5" HD. I have several jumpers from previous 3.5" HD. Are they compatible? If not, guess I will have locate one at a repair shop. I know that Mac HDs aren't supposed to need jumpersnbut this one drive works when in a computer but won't work in an external enclosure (And I have verified the enclosure is in working order). In either my PB or iBook, the HD ribbon is long enough to include the 4 'jumper' pins while the HD ribbon for the external leaves the jumper pins uncovered. I've never heard of a HD what would not work in an enclosure before.

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The 2.5" drives use smaller jumpers than most 3.5" drives, however very few 2.5" drives need a jumper, SATA got rid of jumpers alltogether.

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I used a jumper I had from a 3.5" drive. Set it for cable select. It works. Go Figure.

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Check my answer on this question and especially the link to drive jumper settings: When initializing the HD, I get a failure due to Input/Output error

What drive are you using?

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I got the PDF of the jumper placement. I am assuming a jumper is a jumper is a jumper. That I can use one of the jumpers I already have. They fit. I was simply wondering if jumpers are specific to the drive size. The drive is a 30 GB Fujitsu MHT2030AT. I found the site (Toshiba how has Fujitsu drives), downloaded the speciific datasheet for the jumper settings and know the setting for cable select and slave (master has no jumper and it did not work previously with no jumper, guess I will try the cable select then the slave).

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I owned many IDE 2.5" USB and firewire enclosures and never needed to install jumpers on the hard drive. They all work as Master in the external enclosure. You need to install jumpers when there are two HDs sharing the same IDE bus (Master, Slave or Cable Select) but when connected on a firewire or USB port the drive should have a Master configuration so no jumper installed.

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I understand you are talking about the IDE connector on a 2.5" drive. These always have 44 pins, which include 40 data pins that are the same as those on a 3.5" drive, plus 4 more pins for power (+5 V) and ground. (In the group of 40 pins, sometimes one pin in the middle is cut out as a polarizing "key".) Thus far, I haven't seen a drive that doesn't work when only these 44 pins are connected.

Now, many 2.5" drives do have an extra 4 jumper pins that are normally uncovered, and their typical purpose is to force a drive into IDE master or slave mode. However, you need to check the jumper configuration for the exact model drive you have. If you just attach a jumper across these pins without knowing what they do, you can short something out and damage the drive. If you search for the exact manufacturer and model of the drive, you can usually find the technical details easily enough.

Jumpers come in various sizes. The most common used to be on 0.1" (2.54 mm) centers, but these days ones on 2mm centers are more common. There are some that are even smaller than that.

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40-pin IDE/ATA Connections for 3.5" Desktop Hard Drives

1. Pin/Slot 20 (arrowed above) may have an absent pin or be blanked of as a key identifier. It carries no data nor power.

2. The outside notch beside Pins/Slots 19 and 21 may or may not be present.

3. The ribbon cable normally has a red line going to Pin/Slot 1.

'''44-pin IDE/ATA Connections for 2.5" Laptop Hard Drives

'''

The first 40 are the same as their desktop cousins but there are an additional four pins (41 to 44) which use 5V power normally carried by a molex connector on a desktop hard drive.

Don't confuse the four pins (41 to 44) with another bank of four pins (- usually separated from the other 44 pins by a gap -) which are for jumpering the laptop hard drive. These are usually not jumpered at all on laptop hard drives.

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