USB Flash Drive Speed Tests – VID 58f, PID 0 #promo #usb


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USB Flash Drive Speed Tests – VID = 58f, PID = 0

Welcome to Speed Tests Web site for USB Flash Drives.
In this page, you can find the speed test results of USB flash drives, made by USBDeview utility. USBDeview make this test by writing a large file into the USB flash drive, and then reading back the same file to getting the read speed. The speed is calculated and displayed in Megabytes per second (MB/Sec). Be aware that all these tests are made by making a sequential read and write operations of a single file. When you use multiple small files, you’ll probably get much lower read/write performances.

If you want to test the read/write speed of your own USB drives and share the results with other people, you can follow the instructions in this page: Test and publish the speed of your USB flash drive.

There is also a summary page. which contains a summary of speed tests for USB drives that accumulated 5 speed tests or more.

Search other USB flash drives:

Some Remarks

  • You can click the column headers of the speed tests table in order to sort by the desired field. For example, if you want to easily find out the drives with largest write speed, simply click the ‘Write Speed’ link in the column header.
  • The vendor name in the speed tests table is determined according to the VID (Vendor ID) of the USB device. The vendor names list was taken from the latest VID/PID list in http://www.linux-usb.org/usb.ids

  • The drive size displayed in the speed tests table is the real size of the flash drive, and it represents the largest file size that you can copy into this drive. Be aware that for most vendors, the actual size of files that you can store inside the drive is less than the offical drive size. For example, if you purchase a 4GB USB flash drive, the real drive size might be 3.7 GB.

  • If you can click the product name link, you’ll get the list of all speed tests of products with the same PID and VID.

  • In order to keed this speed tests table reliable, I reserve the right to remove speed test entries that looks extremely unreliable.
  • Because the database is already quite large, the main page only lists the USB speed tests submitted in the last 60 days.

    To more easily compare the speed of USB flash drives, you can filter the list according to drive size group:

    Notice that the USB devices of last size group (above 64 GB) are not really flash drives. they are external hard disk drives plugged to USB. I originally created this Web site for flash drives, but because some people already submitted the speed test results of external USB disks, I added a group for them too.


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  • The Ultimate Guide to Buying in Bulk – The Simple Dollar #bulk


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    The Ultimate Guide to Buying in Bulk

    Over the last several years, Sarah and I have become reasonably skillful practitioners in the art of buying items in bulk, through trial and error.

    Our goal, of course, is to save money. A well-executed bulk purchase of an item can save you a lot of money. A poorly-executed one, though, can cost you money, as Sarah and I have learned the hard way several times over the years.

    Lately, I ve been trying to write an ultimate guide to buying in bulk, but I ve realized that everything I write essentially boils down to a handful of sensible guidelines. If you stick to these steps, you ll save significant money when making bulk purchases. The further you stray, the less likely you are to save money on your bulk buys.

    The Ultimate Buy in Bulk Guidelines

    1. Price-per-unit is king.

    The entire goal of a bulk buy is to make sure that the cost per unit is as low as you can possibly get it, then buying a ton when that cost per unit is low. Thus, to really maximize a bulk buy, you need to know how to calculate cost per unit quickly and efficiently.

    Cost per unit, in concept, is really easy to calculate. A unit is the actual amount of something you re getting. A roll of toilet paper is not a unit. However, a square foot of toilet paper is a unit. A bottle of ketchup is not a unit. However, a fluid ounce of ketchup is a unit. An actual unit will always directly relate to how much you use, so a bottle of ketchup might be used a varying amount depending on the size of the bottle, but you ll usually use an ounce of ketchup the same way regardless of the bottle it s in.

    Cost per unit requires you to figure out how many units you would actually be buying (usually multiplication). Then, you take the total cost of your purchase and divide that by the number of units.

    What you are always looking for are situations where you can push the cost per unit at least 50% below what you would normally pay. Usually, the large versions of the items have a lower cost per unit, but it s worth calculating it in each case.

    2. Never bulk buy an item you haven t tried before.

    You may find that the product doesn t meet your needs, even if you expect that it will.

    For example, I bulk bought a particular type of men s body wash a while back, only to find out that it dried out my skin something fierce. It gave my skin a feel that could be described as crunchy or crispy. That s not something you want in a soap that you re going to use daily for the next several months.

    I ve bought trash bags where the bottom has ripped out of nearly every other bag. I ve bought hand soap that didn t lather. I can go on and on with examples of products that seem like they would work but simply do not.

    Don t waste your time bulk buying an item unless you ve personally used it and you know that it works for your needs.

    3. Never bulk buy perishable goods unless you re going to go home and process all of it immediately.

    We rarely buy anything perishable in bulk. On the rare occasions when we have done so, we ve gone home and used all of it within a day or two, either directly in meals or by canning or freezing it.

    Sometimes, you will find stupendous deals on fresh items if you buy a lot of them. For example, I once bought about fifty pounds of tomatoes for the price of about five.

    The problem is that even if you save 50% or 75% off of the item, if you don t use a significant portion of that item, you re not saving money. Even then, you still have to deal with getting rid of the excess. With perishables, your window of opportunity to use the item is limited and the cleanup of the excess can be messy.

    If you have a plan for all of it say, going home and making four fresh lasagnas and freezing the rest of the tomatoes you just bought then it can still be a good buy. Without a plan, though, a bulk buy of a perishable item is more trouble than it s worth.

    4. Stack coupons and sales when bulk buying.

    The best time to bulk buy is when you can stack coupons on top of bulk purchases. With a bit of planning, you can do this really well, especially if there are no limits.

    When I browse through coupons, if I happen to notice a particularly good one, I ll print off several copies of that coupon. Then, I ll hold onto them and wait until there s a sale and, surprisingly often, the local stores will have a sale on that item well before the coupons expire. At that point, I ll go in there and drop all of the coupons at once on top of that sale.

    Most stores will work with you on this, particularly if the sale doesn t have a limit. Explain that you want to use these coupons before you go through and they ll make it work for you.

    Remember, the goal is to minimize the cost per unit, and using a coupon on top of a sale achieves that quite effectively.

    5. Ensure you have adequate storage space before you buy.

    If you don t have a place to put the stuff, you re going to find yourself in a pretty serious pickle when you get home. If you re thinking of buying something in bulk, make sure you have storage space before you make that purchase.

    Also, it s worth noting that you should never, ever consider increasing your living space just so you can swing more bulk buys. If you re looking at a home and are leaning toward a more expensive one because of a roomier basement for your bulk purchases, then you need to re-think things. Getting a bigger mortgage, paying more property taxes, and having higher utility costs so you can store some extra bulk items is not a wise financial decision.

    Many families in our area have a storage room in the basement that also doubles as a tornado or storm shelter (we have one, but it functions as a laundry room for us). This is a great spot for stowing away bulk purchases so that they don t take up kitchen space.

    6. Don t pin yourself against the wall by running out of non-perishables.

    If you get into a routine of buying in bulk, you ll start to get used to just heading to the place where you keep those purchases and refilling whenever you need something. Of course, even with bulk purchases, you ll run out eventually and then, if you need something, you re up against the wall.

    A good routine to establish is whenever you see that you only have one or two items left out of your bulk stash of a particular item, start actively looking for a bargain on that item. Some items go faster than others, so keep that in mind. I like to make sure I m good for at least one full month with most nonperishables.

    Generally, if I know I have enough of an item already, I don t even look at sales on that item, but sometimes something absurd jumps on you. I recently purchased a ton of men s body wash for roughly a quarter a bottle. I m now sitting on quite a few bottles, but I m probably going to donate some to the local food pantry.

    7. Don t bulk buy everything at once unless you have an enormous bankroll.

    When people first start getting into bulk buying, they often go crazy and buy everything in bulk, spending themselves into debt. You do not want to start off by heading to the store and dropping several hundred dollars if you don t have it in hand.

    A much better approach is to simply raise your household supply budget by about 25% for several months. Use that extra 25% to engage in some bulk buying, taking advantage of big sales when you see them.

    Eventually, you won t need that extra 25%. In fact, your household budget will now be significantly lower than it was before because most of your household purchases are simply irregular refills of things you already bought in bulk, plus you now can sit and wait for the truly good discounts.

    Don t do it all at once unless you have that cash easily available or you undo the financial advantages of bulk buying.

    8. Split up bulk buys with friends and family.

    A final tip: if you see a really big bulk purchase that could save you a lot of money like a 50 pound bag of rice or something like that but you just can t deal with the amount you d be buying, talk to some friends. If you can get three friends to split that huge bag of rice with you, you ll each wind up with 12.5 pounds of rice, which is much more tolerable, plus three of your friends got the same discount.

    I ll often check with people in my area on social media for these kinds of bulk purchases. If you can find a few people who want to jump on board, just go ahead and buy it, then split it up into equal amounts and figure out what everyone owes you.

    Sure, you might end up getting stuck with a double portion of a bulk buy, but you can always turn to your friends to get rid of that via someone else.

    Bulk buying really can save you a lot of money, but you can t just charge in. Plan things in advance a little bit and you ll be very glad you did.

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    Product Categories – Featured Custom USB Drives and Executive USB Pens –


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  • USB Flash Drives

    Our mission here at USB Memory Direct is to provide you with the highest quality wholesale custom flash drives possible. As a business we understand how important brand image is, to us our brand is everything and we would never do anything that might damage it. Being a business that values our reputation we understand how important it is to have a product that works, especially when your brand will be printed on it. That is why we only trust the best with our brand and so should you.

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    USB pinout diagram @ #usb #pinout #diagram


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    USB pinout

    USB (Universal Serial Bus) designed to connect peripherals such as mice, keyboards, scanners, digital cameras, printers, hard disks, and networking components to PC. It has become the standard connection method for wide variety of devices.

    Universal Serial Bus (USB) is a specification to establish communication between devices and a host controller (usually personal computer). Nowdays USB has replaced a variety of earlier PC interfaces (such as RS-232 serial or parallel port). Due to the ability to supply power to the preipheral devices USB is often used as a power charger for portable devices.

    An USB system architecture consists of a host controller, a USB ports, and multiple connected devices. Additional USB hubs may be included allowing branching into a tree structure with up to five tier levels. USB can connect computer peripherals such as mice, keyboards, digital cameras. PDA. mobile phones. printers, personal media players. flash drives, GPS. Network Adapters, and external hard drives. For many of those devices, USB has become the standard connection method.

    USB interface aimed to remove the need for adding expansion cards into the computer s PCI or PCI-Express bus, and improve plug-and-play capabilities by allowing devices to be hot swapped or added to the system without rebooting the computer.

    The USB Pinout:

    USB connectors

    There are several types of USB connectors. The connector mounted on the host or device is called the receptacle, and the connector attached to the cable is called the plug. The original USB specification detailed Standard-A and Standard-B plugs and receptacles. Nowdays there are 7 USB connectors known: Standard-A, Standard-B, Mini-A, Mini-B. Micro-A, Micro-AB, Micro-B. Mini-USB pinout and Micro-USB pinout are slightly different: standard USB uses 4 pins while Mini-USB and Micro-USB uses 5 pins in connector. The additional pin is used as an attached device presence indicator.

    USB pinout signals

    USB is a serial bus. It uses 4 shielded wires: two for power (+5v GND) and two for differential data signals (labelled as D+ and D- in pinout). NRZI (Non Return to Zero Invert) encoding scheme used to send data with a sync field to synchronise the host and receiver clocks. In USB data cable Data+ and Data- signals are transmitted on a twisted pair. No termination needed. Half-duplex differential signaling helps to combat the effects of electromagnetic noise on longer lines. Contrary to popular belief, D+ and D- operate together; they are not separate simplex connections. USB 2.0 provides for a maximum cable length of 5 meters for devices running at Hi Speed.

    USB transfer modes

    Univeral serial bus supports Control, Interrupt, Bulk and Isochronous transfer modes.

    USB interfaces: USB 1.0, USB 2.0, USB 3.0.

    There are three USB versions known nowdays:

    USB 1.0

    • released in 1996.
    • Specifies data rates of 1.5 Mbit/s (Low-Bandwidth, is mostly used for Human Input Devices (HID) such as keyboards, mouses, joysticks and often the buttons on higher speed devices such as printers or scanners) and 12 Mbit/s (Full-Bandwidth).
    • nowadays is still used used by some devices that don t need faster data transfer rates.

    USB 2.0

    • released in 2000
    • in addition to USB 1.0 adds signaling rate of 480 Mbit/s (Hi-Speed)
    • compatible with USB 1.0, but some hardware designed for USB 2.0 may not work with USB 1.0 host controllers.

    USB 3.0

    • released in 2008
    • added transmission rates up to 5 Gbit/s (SuperSpeed)

    USB 1.0 and USB 2.0 shares same connector pinout, USB 3.0 pinout features new connectors.

    A USB device must indicate its speed by pulling either the D+ or D- line high to 3.3 volts. These pull up resistors at the device end will also be used by the host or hub to detect the presence of a device connected to its port. Without a pull up resistor, USB assumes there is nothing connected to the bus.

    In order to help user to identify maximum speed of device, a USB device often specifies its speed on its cover with one of the USB special marketing logos.

    When the new device first plugs in, the host enumerates it and loads the device driver necessary to run it. The loading of the appropriate driver is done using a PID/VID (Product ID/Vendor ID) combination supplied by attached hardware. The USB host controllers has their own specifications: UHCI (Universal Host Controller Interface), OHCI (Open Host Controller Interface) with USB 1.1, EHCI (Enhanced Host Controller Interface) is used with USB 2.0.

    USB powered devices

    The USB connector provides a single 5 volt wire from which connected USB devices may power themselves. A given segment of the bus is specified to deliver up to 500 mA. This is often enough to power several devices, although this budget must be shared among all devices downstream of an unpowered hub. A bus-powered device may use as much of that power as allowed by the port it is plugged into.

    Bus-powered hubs can continue to distribute the bus provided power to connected devices but the USB specification only allows for a single level of bus-powered devices from a bus-powered hub. This disallows connection of a bus-powered hub to another bus-powered hub. Many hubs include external power supplies which will power devices connected through them without taking power from the bus. Devices that need more than 500 mA or higher than 5 volts must provide their own power.

    When USB devices (including hubs) are first connected they are interrogated by the host controller, which enquires of each their maximum power requirements. However, seems that any load connected to USB port may be treated by operating system as device. The host operating system typically keeps track of the power requirements of the USB network and may warn the computer s operator when a given segment requires more power than is available and may shut down devices in order to keep power consumption within the available resource.

    USB power usage:

    Bus-powered hubs: Draw Max 100 mA at power up and 500 mA normally.
    Self-powered hubs: Draw Max 100 mA, must supply 500 mA to each port.
    Low power, bus-powered functions: Draw Max 100 mA.
    High power, bus-powered functions: Self-powered hubs: Draw Max 100 mA, must supply 500 mA to each port.
    Self-powered functions: Draw Max 100 mA.
    Suspended device: Max 0.5 mA

    Dedicated charger mode:

    A simple USB charger should incorporate 200 Ohm resistor between D+ and D- wires (sometimes shortcircuit D+ and D- together is enough). The device will then not attempt to transmit or receive data, but can draw up to 1.8A, if the supply can provide it.

    USB voltage:

    Supplied voltage by a host or a powered hub ports is between 4.75 V and 5.25 V. Maximum voltage drop for bus-powered hubs is 0.35 V from its host or hub to the hubs output port. All hubs and functions must be able to send configuration data at 4.4 V, but only low-power functions need to be working at this voltage. Normal operational voltage for functions is minimum 4.75 V.

    USB cable shielding:

    Shield should only be connected to Ground at the host. No device should connect Shield to Ground.

    USB cable wires:


    Zoom Transcription Services and Training #medical #transcription #training, #online #transcription #services #online


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