``` 980M free ``` before we discuss what has happened, make a small modification to the program (for example add an exclamation mark after World on line 10 and do another save, a bit different this time: ``` SAVE "hello" ``` and follow it by **CAT "hello\*.\*"** . Now you'll see: ``` hello 1K hello.bas 1K hello.bas.bak 1K 980M free ``` Repeat the last save command one more time and then do **CAT "hello\*.\*"** again. The screen now shows: ``` hello 1K hello.bak 1K hello.bas 1K hello.bas.bak 1K 980M free ``` If you however, had started with a **SAVE "m:"** thus redirecting the *default drive* to the *RAMdisk*, everything would have been a bit different. First by not displaying a **hello.bas.bak** and now after the entire series of commands **CAT** would have returned: ``` HELLO 1K HELLO.BAK 1K HELLO.BAS 1K 59K free ``` so, why the difference? Let's take it from the beginning. We initially saved a *NextBASIC* program that was named **hello.bas**; then once we saved it again, the file with the same name on the drive had **a .bak** *type* appended to it. Then we saved the same program with a name without **a** *type*. In the second case since we were trying to save to a *+3DOS filesystem* (the *RAMdisk)*, *NextZXOS* can only use 8+3 character *filenames* unlike the *FAT filesystem* that can have very long *filenames*. So in the second case, instead of appending the **.bak** *type* to the original **hello.bas** file, it stripped the **.bas** *type* and replaced it with .**bak**. What followed is, that we tried to save the same name without *type* but now *NextZXOS* had a decision to make; which *filename* with **.bak** *type* to keep? As you could easily find out by LOADing back the **hello.bak** file, the last version saved is the one retained. Your **PRINT** statement would be the one with the exclamation mark and not the one without. This example, makes an important point that due to the disparate types of *filesystems* *NextZXOS* can handle, the *auto backup* feature provided is nice but it's not a panacea, so do not rely on it exclusively and instead name your files explicitly! A slight variation of the **SAVE** command as it deals with *NextBASIC* programs is that you can add the **LINE** *modifier* with either a numerical parameter or a label name after it. For example saving the program above with: ``` SAVE "hello.bas" LINE 10 ``` and then doing ``` LOAD "hello.bas" ```