T530 Default Partitions... Safe to Delete?

I've got a 2 year old T530 with regular 320GB HDD (not SSD) which came with Win8 preinstalled. When I received the laptop, I created the Win8 recovery USB stick and installed Linux Mint 14 Cinnamon alongside Windows 8.
Now, two years later, I've never used the Windows 8 installation and I'd like to get rid of it and install Mint 17 or Crunchbang linux, or both, and once that's done I'll remove the Mint 14 installation since it's at End Of Life in terms of patches and updates.
My initial question is regarding the Lenovo default partitions which are still on the drive. In the Linux Mint 'Disks' utility I've got the following partitions on the drive, reading from left to right:
Unlabeled /dev/sda5 1MB Type Unknown Contents Unknown
WINRE_DRV /dev/sda1 1GB System Recovery NTFS In Use: No
SYSTEM_DRV /dev/sda2 273MB EFI System Fat32 In Use: No
Unlabeled /dev/sda3 134MB MS Reserved Contents Unknown
Windows8_OS /dev/sda4 129GB Basic Data NTFS In Use: No
Unlabeled /dev/sda6 200MB Basic Data EXT4 /boot
Unlabeled /dev/sda7 18GB Basic Data EXT4 /
Unlabeled /dev/sda8 15GB Basic Data EXT4 /home
Unlabeled /dev/sda9 5GB Linux Swap swap
Storage /dev/sda10 152GB Basic Data NTFS /storage
I plan to wipe out /sda4 which is the Win8 partition, and use it for a new linux installation. However, what about partitions /sda1, /sda2, /sda3, and /sda5 in light of the two scenarios below:
Scenario 1: No intention of ever again using Windows 8 on this laptop...
Which partitions can I wipe out without damaging my ability to boot the laptop at all?
Scenario 2: I *might* want to eventually restore Windows 8 to the laptop
Which partitions can I wipe out now, to use for linux now, but possibly recovering Windows later (unlikely, but I'd like to know so that I understand the implications a little better).
Separate general question:
Do I need to keep the EFI System partition if I no longer have any intention of keeping Windows 8 on the machine? I'm worried that if I wipe it out the system will be unbootable even if I no longer have Windows 8 on it to begin with... I'm reading as much as I can about EFI but I'm still unclear whether that partition is necessary or can be safely wiped.
Thanks for any help and insight you can provide!
mins.

Regarding partitions on Lenovo preloaded win8 systems read this message with helpful links and explanations http://forums.lenovo.com/t5/Lenovo-3000-and-Essential/New-G580-has-seven-partitions-Help-identify/m-... and the message #8 if you want to remove several partitions.
sda1...sda4 partitions are the same as 1...4 ones on standard Lenovo systems and in message above.
sda5 partition doesn't belong win8. Seems it's just unallocated area. I'm sure it could be removed.
Keep in mind usually System_DRV has active and boot attributes. In your case you have another such boot partition, definitely windows bootloader is replaced. It means you are not able to boot into the recovery area. Aren't you? So if you'll decide to recover win8 w/o external recovery media you'll are not able to perform that.
Also Lenovo recovery media should (!) allow to restore laptop to its factory condition with all partitions and attributes. Antire drive will be wiped. So to ensure try to perform the recovery on another drive and remove every win8 partition on your current primary drive w/o troubles.
Regarding EFI (and GPT partionoing scheme you have now) it's not easy to switch them to BIOS mode and MBR. No problem to return EFI/GPT settings when you'll decide to perform win8 recovery in the future.
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Regards
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T530 Default Partitions... Safe to Delete?

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