Macbook pro suddenly not reading a usb that was working earlier.

I have a Macbook pro & all of a sudden it's not reading a usb that was working earlier. I get a message "the disk you inserted was not readable..." I'm new to Mac & dont have much tech knowledge, so simple terms would be appreciated. Thank you.

this is what it shows
Name : USB DISK 2.0 Media
          Type :           Disk
          Partition Map Scheme :           Master Boot Record
          Disk Identifier :           disk1
          Media Name :           USB DISK 2.0 Media
          Media Type :           Generic
          Connection Bus :           USB
          USB Serial Number :           0710255E9B15CD14
          Device Tree :           IODeviceTree:/PCI0@0/EHC2@1A
          Writable :           Yes
          Ejectable :           Yes
          Location :           External
          Total Capacity :           8.01 GB (8,006,074,368 Bytes)
          Disk Number :           1
          Partition Number :           0
          S.M.A.R.T. Status :           Not Supported

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Model Identifier:          MacBookPro5,3
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Macbook pro suddenly not reading a usb that was working earlier.

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