Identifying Appropriate High-Speed Flash Drives for PATSS Duplication

Modern flash drives have USB 2.0 connectivity. However, a majority of them do not and can not use their full potential of 480 mbps (megabits per second) or 60MBps (megabytes per second). This is due to NAND (Not AND) “logical processing” flash chips.  The read/write speeds of NAND chips vary as much depths in the ocean.

The fact that USB 2 devices were designed to handle a maximum capacity of 60MBps does not mean that the flash drive you purchase transfers data at this speed. Chances are that is only processes at a fraction of that speed.  This is especially true if you paid a very low price for the flash drive.

The redesign of IDEAL Group’s Portable Assistive Technology (AT) Software forces it to launch and run directly off of a flash drive.  The processing requirements of these functions require fast, flash drive, read/write speeds.  If you use a slow speed flash drive the user may have to wait as long as 5 minutes for an application to load and run.  Slow speeds in this area render the technology useless.

All flash drives made today are sold with an “X” speed rating as an indicator of how fast the card can transfer files. A higher X-speed rating is designed to perform faster. It may use the “read” or “write” speed as the basis for comparison, depending on the manufacturer. PEAK uses the read speed as the basis, meaning that a PEAK 200X card will read 200 times as fast as a standard (1X) card.

  • 1X-speed rating is equal to 150 kilobytes (KB) of data transferred per second.
  • 200X = 200 times 150 kilobytes = 30,000 KBps = 30 MBps

Flash drives can have data transfer rates from 1X to over 200X. Comparing these two extremes is like comparing a tricycle to a Ferrari.

You need to take great care when purchasing flash drives to use as Portable Assistive Technology (AT) Software SmartDrives.

We recommend Xporter XT Boost High-Speed Flash Drives from Patriot.  They run between 150-200X (22.5-30.0MBps)

Note: Before purchasing large quantities of flash drives for duplication purposes, buy one and it it out. Sometimes sellers of flash drives misrepresent their specifications.

The following chart compares equivalent data transfer rates:

Equivalent Unit Data Transfer Rate Data Transfer Rate Description
1 MBps megabytes per second
8 Mbps megabits per second
1,000 KBps kilobytes per second
8,000 Kbps kilobits per second
1,000,000 Bps bytes per second
8,000,000 Bps bits per second

The following chart compares X-Speed to data transfer rates in MBps and KBps:

X-Speed MBps KBps
52 7.8 7,800
60 9.0 9,000
80 12.0 12,000
120 18.0 18,000
150 22.5 22,500
200 30.0 30,000

We recommend using Flash Memory Toolkit to determine the read/write speeds of flash drives before you purchase a lot of them!

We recommend using Patriot Xporter XT Boost High speed USB Flash Drives

Acceptable Read/Write Speeds:

Unacceptable Read/Write Speeds:

Don’t even think about it:

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