How to get my flash drive files to open again

Okay so the other day, a friend of mine used my main flash drive to save an essay for psychology from her Mac laptop. For some reason it didn't work or something so she used my extra one instead. Now my main flash drive is completely empty of all my files and my other one is perfectly fine when i plug it into my Lenovo laptop. WHAT DO I DO? Every time i try something on command prompt it says there's not enough space in the disk to restore lost files. What does that mean? Someone please help i had so much important stuff saved on my flash drive. Would it possibly open on a Mac?

Which of these two laptops are better? - 1

Looking for a Quality Built & Reliable Laptop. Currently, Leaning towards the HP. Is that a wise choice. I don't think I need for SSD.

IS it true that both Lenovo and HP have wireless card problems. I'm finding that a lot in the reviews.

Doing Photoshop, Civilization 5 (Only game I play) , Word, Excel, Accounting, & Powerpoint.

Lenovo
IdeaPad Y510p Laptop - 59405673 - Dusk Black
Processor
4th Generation Intel Core i7-4700MQ Processor (2.40GHz 1600MHz 6MB)
Operating system
Windows 8.1 64
Display
15.6" FHD LED Glossy (1920x1080)
Graphics
NVIDIA GeForce GT755M GDDR5 2GB
Memory
8.0GB PC3-12800 DDR3L SDRAM 1600 MHz
Hard Drive
1TB Hybrid 5400 RPM + 8GB SSHD
Optical Drive
DVD Recordable (Dual Layer)
Network Card
Intel 7260 b/g/n Wireless (2x2 BGN)
Bluetooth
Bluetooth Version 4.0
Warranty
One year
Battery
6 Cell 72 Watt Hour Lithium-Ion

OR

HP Envy

- Windows 8.1 64
- 4th generation Intel® Core™ i5-4200M Processor
- NVIDIA GeForce GT 740M Graphics with 2048MB of dedicated video memory
- 15.6-inch diagonal Full HD BrightView LED-backlit Display (1920x1080)
- 8GB DDR3 System Memory (2 Dimm)
- 750GB 5400 rpm Hard Drive
- NO mSSD Hard Drive Acceleration Cache
- No Additional Office Software
- Security Software Trial
- 6-Cell Lithium-Ion Battery
- No Internal DVD or CD Drive
- Backlit Keyboard
- HP TrueVision HD Webcam w/ integrated digital mic
- 802.11b/g/n 2x2 WLAN and Bluetooth® [2x2]

How to get my data from the hard-drive of my old laptop?

My old laptop doesn't work anymore, but its hard-drive is ok. It was a Dell XPS M1210. Now i have a Lenovo W500 but i need my data from my old laptop. Is it at all possible to get that data?
OS of both laptops is windows 7.

Added (1). Thanks to all of you. Your answers were all helpful.

Added (2). Thanks to all of you. Your answers were all helpful.

How to charge my laptop in the car?

I have a Lenovo Y500 and it's one of the SLI so it requires a 170w charger. I was wondering if I could just get a cheap adapter that will plug into the car port than allow me to plug my charger in and if that will work? If not, what will work?

Adding SLI too Lenovo Y510P?

I have a Lenovo Y510P with a 2GB GT755M Graphics Card. I want to know if there's a way to add the second graphic cards, I don't exactly know what its called SLI or what ever to make it 4 GB…

My Paint Tool SAI license isn't working?

I bought the license, and received an email confirming it. Yet somehow, every time I try to open it using SAI it still tells me that I need to buy a license to continue using it.

I have a lenovo laptop with windows 8. Could anyone help?

Added (1). Well I uninstalled it and found out that maybe it's the program I opened it with. Do I open it with SAI? Because immediately after I entered that last time it gave me the message about the trial period.

My computer doesn't have a cd player?

It's probably not called a CD Player but I have a Lenova Ideapad and it doesn't have one. I bought a bunch of blank CD's to start burning CD's, and didn't realize that my laptop doesn't have one. Is there anything I can buy?