Source: Fudan University Sun Moonlight BBS Hardware Edition Author: SLAYER Mobile Hard Disk is a non-standard USB device, which is far less reliable in use, a lot of problems, here is a lot of common situations:
Relevant basic knowledge See the mobile hard disk I wrote FAQ, PCMARKET and HARDWRE.
1. If your hard disk box is 50 yuan, especially the word IBM is like, please change this box. This kind of box can be early, since the quality of production from production since 2003, many faults happen to this box, if you still love your hard drive, please change it.
2, mobile hard disk partition should not exceed 2.
3. It is best not to insert the mobile hard disk of the box below the machine, and the mobile hard disk is used to exchange data when the mobile phone is used to exchange data. Compared to notebook built-in, the laptop hard drive in the mobile hard disk works in a harsh environment, should try to shorten the working time. The correct way to use is to use local hard drives to download information, then copy to mobile hard drives instead of hanging on the machine. This statement is equal to the death penalty for the USB1.1 interface Copy massive data. If you want a lot of COPY data, add a USB2.0 card.
4, do not give mobile hard drives to consolidate disk fragment, the method of organizing the data in the entire partition, and then go back.
5, mobile hard drive can not recognize or COPY how to solve it? (1) Do not use the USB extension line, the quality of this line is generally not very good, it will make the USB data synchronize error, so that the mobile hard disk cannot work properly. Do not use the front USB interface on the chassis, the reason is the same. Try to insert your mobile hard disk on the original USB port. (2) Eliminate your inferior USB hard drive box, replace the inferior data line is a high quality USB cable with shielded layer (the line of a better box belt). (3) The USB interface is poor, the motherboard of the non-Intel chipset sometimes has a problem of poor USB compatibility, but now there is almost only nforce2 in the mainstream chip group, the legendary new BIOS and USB driver improve nForce2 USB compatibility, but practical proves is limited. Methods that completely solve this problemware only with a PCI's USB2.0 card, other references 6.
6, how to solve the problem of insufficient power supply? (Insufficient power supply is a big reason) (1) Buy a better USB mobile hard disk box. (2) Purchase 4200 revolutions of notebook hard drives to do mobile hard drives. Don't buy 5400 revolutions. Don't believe in the current value of the on-the-hard disk, there is no reference value. Practice proves that Hitachi's 4200 revolutions such as 4k80 4k40 80GN is a good choice. Never buy Fujitsu or Toshiba because there is no formal channel business in the mainland. Generally do not buy ST, because the hard drive of ST is generally 5400, although the current value is 0.47A. (3) When purchasing a laptop, consider the power supply capacity of the USB port. It has been shown that the USB interface power supply is too weak: Samsung Q20 / Dell 300M / X300; Sony V505; almost all R, IBM R40; Toshiba P2000 / 2010 .... USB power supply capacity, more common in Japan, Korean . I am most appreciated is the USB port of IBM X31, regardless of mobile hard disk (even 5400 revolution); external Combo is all eating, and its power supply is not absurrent. If you purchase a PCI's USB2.0 card, you have to pick 4-pin secondary power supply. If you purchase the PC card USB2.0 transfer card with your notebook, you have to pick up a transformer to assist and supply it, you have to bring a PS2 assistant Power supply. (4) The mobile hard disk box itself also has a secondary power supply. The good box directly gives a transformer. The poor box also has PS2 or USB power supply line. When the power is insufficient, it is necessary to plug, even if the USB port is enough to drive the hard disk, if not a short time Work, recommendations are also plugged in, the power supply of the USB interface is always very boring. 7, don't mix the power line! ! The line of a box is only for a box, and the power supply line of a PC card can only be used for that model. The interface voltage definition of the power supply line is different, and the blank is slightly burned, and the burn is heavy.
8, how to make the mobile hard drive run faster? Copy's large file is definitely more efficient than fine subcoutrios, the following data is for large file COPY. (1) USB1.1 must be upgraded to USB2.0. The set machine has a PCI's USB2.0 card, and the notebook has a USB2.0 card for the PC card. When buying a card, you can't be greedy, the notebook card below 100 yuan, don't buy a trump card below 50 yuan. (2) The model of the hard disk should be a new point, usually produced in 2002 has the ability to run to 15m / s . (3) USB interface: First, power supply is sufficient. The control chip is better in NEC or Intel ICH4 / 5 South Bridge, followed by Ali, the most VIA. However, these chips have actually 15m / s's ability, but also to see the design and workmanship of the PCB board. (4) The box is good. Chip selection isD300> Ali 5621> Meson? (Forgot the model)> GL811 = ali (wretched version, model forgot, small), NEC's bridge chip is rarely used on the hard disk box, generally in the optical drive box Using, NEC is also very good, and can be compared to ISD300. In fact, GL811 has a level of 18m / s, and a truth of the transfer card, and the speed is more close to the design and workmanship of the PCB. Card and box, picking expensive buying definitely is not wrong. (5) Local hard drives are also fast enough. (6) USB1.1 The speed is 1m / s, the level of USB2.0 is 10m / s, if less than 10m / s, then at least one bottleneck in the notebook hard disk, box, interface, local hard disk. I use the ASUS Intel 845PE motherboard, Yuan ancient dual interface box (ISD300), Hitachi 80GN hard drive, local hard disk ST7200.7, speed can reach 22m / s, the same platform is 18m / s. 22m / s is almost the limit of hard drive transmission speed, it seems that the bandwidth of USB2.0 has not been feeding this time. Inferior USB cards can only run to 4M / s facial differences. (7) Too many fine small documents can also be packaged after packaging.
9,1394 Moving hard disk: (1) Power supply: 6-pin 1394-port rated current from the machine is 1A, is enough to drive all mobile mobile hard drives, or even a trunk hard disk. 4 The needle is not powered, and the mobile hard disk must be supplied separately. The 1394 connected by the PC card cannot be powered, and the PC card must be powered or powered hard. (2) 1394 interface: Better with TI double chip; Ricoh is also very good, but rarely appear in retail Card, IBM X seriesboard is often Ricoh, Ali can also, VIA is the worst (Generally, the main boardboard is loaded), but it is still that sentence, work is important than the chip. (3) Box: The 1394 of the general mobile hard disk is bridged with oxford911, and did not see the shrinkage chip. Oxford922 is a more excellent IC, single-chip to get USB2.0 / 1394 double interface, now there are some high-end 3.5-in-hard disk boxes, and 2.5-inch boxes have not been seen yet. PL-3507 is a product of a Taiwanese IC design company, which is also a single-chip double interface, performance to be tested, I just saw the product. (4) Measure: My platform uses a PCI1394 card of TI double chip, an ancient double interface box (Oxfd911), 80GN, and speed is 22m / s. The peak speed has been tested is also 24m / s. The same box and hard disk are in Compaq X1000 (onboard VIA1394IC), the speed is 17-18m / s. (5) 1394 The biggest advantage is that the CPU has low. 10, protect your mobile hard drive properly. Don't be hit, take lightly; pay attention to temperature, stop too hot; dry waterproof, first delete it.
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